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https://www.change.org/p/cbse-grace-marks-must-be-given-for-maths-class-12-paper-2017?recruiter=696624668&utm_source=share_petition&utm_medium=copylink

Posted by Pratit Luthra (Mar 23, 2017 12:04 p.m.) (Question ID: 4439)

  • GUYS IF YOU WANT GRACE MARKS IN MATHEMATICS THEN PLEASE SIGN THIS PETITION....

    Posted by Pratit Luthra (Mar 23, 2017 12:06 p.m.)
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Will cbse make me paas in maths paper of class 12 session 2016-17 will i get grace marks if i am getting 23 out of 100 ..

Will the checking lenient?? 

 

Posted by Govind Khare (Mar 22, 2017 8:49 a.m.) (Question ID: 4379)

tan-1 x-3/x-4.  +.   tan-1 x+3/x+4. =.  π/4

Posted by Vishaal Velu (Mar 21, 2017 1:02 p.m.) (Question ID: 4324)

  • Answers:
  • I think it is x-2 and x +2 instead of x-3 and x +3 respectively

    Ans.

    {tex}tan^{-1} ({x-2\over x-4})+ tan^{-1}( {x+2\over x+4}) = {\pi \over 4}{/tex}

    Using{tex}tan^{-1} x + tan^{-1}y = tan^{-1} ({x+y\over 1-xy}){/tex}

    => {tex}tan^{-1} ({{x-2\over x-4} + {x+2\over x+4}\over 1-( {x-2\over x-4} \times {x+2\over x+4})}) = {\pi \over 4}{/tex} 

    => {tex}tan^{-1}({2x^2-16\over -12}) = {\pi \over 4}{/tex}

    {tex}=> {2x^2-16\over -12}= tan^{-1} {\pi \over 4}{/tex}

    {tex}=> {2x^2-16\over -12}= 1{/tex}

    {tex}=> 2x^2-16= -12{/tex}

    {tex}=> 2x^2= 4 => x^2 = 2{/tex}

    {tex}x = \sqrt 2{/tex}

    if you use 3 answer ll be {tex}x = \sqrt {17\over 2}{/tex}

    Answered by Naveen Sharma (Mar 21, 2017 7:07 p.m.)
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Find the matrix A such that    

 Matrix of ( 2. -1.                  (-1.   -8

                    1.  0.   * A=.         1.    -2

                     -3. 4)                    9.    22)

                                       

Posted by Vishaal Velu (Mar 21, 2017 12:56 p.m.) (Question ID: 4323)

There are 4 cards numbered 1,3,5and 7 one number on one card . Two cards are drawn at random! Without replacement . Let x denote the sum of the numbers on the two cards .Find the mean and variance of x

Posted by Vishaal Velu (Mar 21, 2017 12:49 p.m.) (Question ID: 4322)

Find the value of x such that the points are coplanar A(3,2,1), B(4,x,5),. C(4,2,-2) and D(6,5,-1)

Posted by Vishaal Velu (Mar 21, 2017 12:47 p.m.) (Question ID: 4321)

  • Answers:
  • Ans.

    Points are A(3,2,1), B(4,x,5), C(4,2,-2) And D(6,5,-1).

    Position Vector of A = {tex}3\hat i + 2\hat j + \hat k{/tex}

    Position Vector of B = {tex}4\hat i + x\hat j + 5\hat k{/tex}

    Position Vector of C = {tex}4\hat i + 2\hat j -2\hat k{/tex}

    Position Vector of D = {tex}6\hat i + 5\hat j -\hat k{/tex}

    {tex}=> \overrightarrow {AB} = \hat i + (2-x)\hat j + 4\hat k{/tex}

    {tex}=> \overrightarrow {AC} = \hat i + 0\hat j -3\hat k{/tex} 

    {tex}=> \overrightarrow {AD} = 3\hat i + 3\hat j -2\hat k{/tex}

    As points are coplaner, then triple scaler product is zero,

    So,

    {tex}\begin{bmatrix} 1& (x-2) & 4 \\[0.3em] 1 & 0 & -3 \\[0.3em] 3 & 3 & -2 \end{bmatrix} = 0{/tex}

    Expanding along R2

    => -1[-2(x-2) -12] -(-3)[3-3(x-2)] = 0

    => 2x -4+12 +9-9x +18 = 0

    => -7x +35 = 0

    => 7x = 35

    => x = 5

     

    Answered by Naveen Sharma (Mar 21, 2017 7:40 p.m.)
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Using the method of integration find the area of the triangle ABC , coordinates of whose vertices are A(4,1). B(6,6),.  C(8,4)

 

 

Posted by Vishaal Velu (Mar 21, 2017 12:45 p.m.) (Question ID: 4320)

Find the coordinates of the point where the line through the points (3,-4,-5)and (2,-3,1),crosses the plane determined by the points (1,2,3),(4,2,-3)and (0,4,3).

Posted by Vishaal Velu (Mar 21, 2017 12:44 p.m.) (Question ID: 4319)

  • Answers:
  • (1,-2,7)

    Answered by Pratit Luthra (Mar 22, 2017 1:08 p.m.)
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Will teachers will do linent marking or strict marking in mathematics

Posted by Singh Gajendra (Mar 21, 2017 9:41 a.m.) (Question ID: 4308)

What is the minimum passing marks required for mathematics in class12?

 

Posted by Vinayak Parihar (Mar 21, 2017 12:12 a.m.) (Question ID: 4294)

  • Answers:
  • 33% marks are required to pass any subject.

    Answered by Naveen Sharma (Mar 21, 2017 7:56 a.m.)
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find the area enclosed between the parabola 4y= 3x2 and the straight line 3x -2y+12=0

Posted by mayank pradhan (Mar 20, 2017 6:32 p.m.) (Question ID: 4222)

how will be the evalution of maths examination conducted today be?

Posted by sandhra francis (Mar 20, 2017 5:36 p.m.) (Question ID: 4218)

integration of sin inverse x divide by x

 

Posted by Shikhar Gupta (Mar 20, 2017 9:38 a.m.) (Question ID: 4180)

For what value of k ,the system of linear equatoin 

            X+y+z=2

           2x+y-z=3

         3x+2y+kz=4

Posted by rabi heishnam (Mar 20, 2017 4:18 a.m.) (Question ID: 4161)

Important. Question given by u r from ncert only?

 

 

Posted by Gurjot Singh (Mar 20, 2017 12:01 a.m.) (Question ID: 4158)

  • Are most of the questions given tomorrow in the exam are from ncert examples?

    Posted by Sreeja Samanta (Mar 20, 2017 12:13 a.m.)
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  • Answers:
  • Yeah......it is for sure.but dont depend on it fullt.practice other problems also.

    Answered by anjana krishnan (Mar 20, 2017 7:37 a.m.)
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Evaluate: Sin a/ sin( x+a) 

Posted by Deepali Kar (Mar 19, 2017 8:54 p.m.) (Question ID: 4151)

Find the shortest distance between the line x-y+1=0 and thr curve y2= x

Posted by Gaurav Pandey (Mar 19, 2017 6:49 p.m.) (Question ID: 4142)

  • pls teachers answer it quickly i really need ur help 

    Posted by Gaurav Pandey (Mar 19, 2017 7:15 p.m.)
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range of |sinx|

Posted by vishal singla (Mar 19, 2017 5:59 p.m.) (Question ID: 4139)

  • Answers:
  • [0,1]

    Answered by Pratit Luthra (Mar 19, 2017 8:05 p.m.)
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A signal which can be green or red with probability 4/5 and 1/5 respectivEly, is received by station A and then transmitted to station B. The probability of each receiving the signal correctly is 3/4. If the signal received at station B is green, then find the probability that original signal is green.

 

Posted by Shivang Puri (Mar 19, 2017 12:54 p.m.) (Question ID: 4110)

3 no.s are selected at random from first 6 +ve integers. x denotes the smallest of 3 no.s selected . find the probabiloty distribution of x?

Posted by Shivam .G (Mar 19, 2017 12:26 p.m.) (Question ID: 4101)

How many marks are allotted to questions on 3D geometry?  

Posted by Abir Dasgupta (Mar 19, 2017 2:46 a.m.) (Question ID: 4083)

  • Answers:
  • One 6 marks question will surely come

    Answered by Pratit Luthra (Mar 19, 2017 8:06 p.m.)
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The probablity of specific problems being solved independently by A and B are 1/2 and 1/3 respectively. If both tried to solve the problem independently find the probablity of 

1. Both of them solved 

2. None of them solve 

3. The problem is solved 

Posted by SHIVANGI DWIVEDI (Mar 18, 2017 9:39 p.m.) (Question ID: 4078)

  • Answers:
  • i) 2/3

    Answered by Pratit Luthra (Mar 19, 2017 8:07 p.m.)
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if A=

1 2
3 5

then find the value of |A^2009-5A^2008|

Posted by Ayush Chaudhary (Mar 18, 2017 8:01 p.m.) (Question ID: 4072)

Shall I be able to print those sample paper I brought? 

Posted by Snata Chakraborty (Mar 18, 2017 11:06 a.m.) (Question ID: 4051)

in a town there are 486 families having 6 children each . if probability of survival of a girl is 1/3 and that of boy is 2/3 . find the number of families having 2 girls and 4 boys

Posted by Priyanka Jadhav (Mar 17, 2017 10:31 p.m.) (Question ID: 4034)

  • does this ques belong to 12 class or somehow 9 too?

    Posted by JD Shukla (Mar 18, 2017 7:04 p.m.)
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a die is loaded in such a way that the probabilities of getting an even number is twice as likely to occur as an odd number.if the fire is tossed twice find the probability distribution of the random variable representing the number as a prime number in the two tosses

Posted by Priyanka Jadhav (Mar 17, 2017 10:12 p.m.) (Question ID: 4032)

Is (A')-1 = (A-1)'

Posted by Pratit Luthra (Mar 17, 2017 6:48 p.m.) (Question ID: 4003)

  • so what??

    Posted by JD Shukla (Mar 19, 2017 2:02 p.m.)
  • U is also called universal set.

    Posted by JD Shukla (Mar 17, 2017 7:08 p.m.)
  • Add Comment
  • Answers:
  • But the question is from matrices and determinants

    Answered by Pratit Luthra (Mar 17, 2017 7:23 p.m.)
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  • A' is a set for U-A

    thus (A')-1 is a set for 1/(U-A)

    A-1=1/A and thus( A-1)' is a set for (U-1/A)

    SINCE  both values are not same therefore  (A')-1 not equals to (A-1).

    Answered by JD Shukla (Mar 17, 2017 7:07 p.m.)
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There are two identical bags  .bag 1 contain 3red and 4black balls while bag 2 contain 5 red and 4 black balls.one ball is drawn at random from one of the bags .find the probability that ball drawn is red.

Posted by Jayasree S Pai (Mar 17, 2017 6:40 p.m.) (Question ID: 4002)

  • Answers:
  • 62/63

    Answered by Deepali Kar (Mar 19, 2017 9:02 p.m.)
    Thanks (0)
  • 16/3

    Answered by Deepali Kar (Mar 19, 2017 9:01 p.m.)
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In a hockey match ,both teams A and B scored same number of goals upto the end of the match so to decide the winner the referee asked both the captain's to throw a dielectric alternatively and decide that the team ,whose captain gets first six ,will be declared as the winner .If the captain team A starts find the probability of winning match 

 

Posted by Vishaal Velu (Mar 17, 2017 12:54 p.m.) (Question ID: 3983)

  • Answers:
  • Ans. Let the probability that A gets a six is 1/6.

    Hence, p = 1/6 and q = 1- 1/6 = 5/6

    Probability of A's Winning =

    {tex}P(A) + P(\overline A \space \overline B A) +P(\overline A \space \overline B \space \overline A \space \overline B A) +…………{/tex}

    => p + pq2 + pq4 +……………… 

    This is in geometric progression, where sum is

    {tex}S_n = {p\over 1-q^2}{/tex}

    Substituing Value  for p and q,

    {tex}=> {{1\over 6}\over {1-({5\over 6})^2}} {/tex}

    {tex}=> {{1\over 6}\over {1-{25\over 36}}} => {{1\over 6}\over {11\over 36}}{/tex}

    Probability of A's winning = 6/11

    Probability of B's winning = 1-6/11 = 5/11

    Answered by Naveen Sharma (Mar 17, 2017 1:37 p.m.)
    Thanks (1)
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please tell me those questions, which have chance in exam of maths?

you can also give me question number along with page number of ncert book.

Posted by AJITsingh RANA (Mar 16, 2017 11:51 p.m.) (Question ID: 3955)

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