CBSE > Class 10 > Mathematics | CBSE Board | Homework Help

a, 2a, 3a, 4a, ....
a₂, - a₁ = 2a - a = a
a₃ - a₂ = 3a - 2a = a
a₄ - a₃ = 4a - 3a = a
i.e. a_k+1 - a_k is the same every time.
So, the given list of numbers from an AP with the common difference d = a.
The next three terms are:
4a + a = 5a, 5a + a = 6a and 6a + a = 7a

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CosA - SinA+1/CosA+SinA-1=CosecA+CotA

Posted by Aman Singh 7 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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Find all the zeroes of the polynomial 2x³+x²-6x-3 if two of its zeroes are √3 and -√3

Posted by Varun Kumar 7 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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in an ap first term is 8 10th term is 33 sum of n term is 142 find n and d

Posted by Rishabh Kumar 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Shweta Shah 7 years, 6 months ago

Question is wrong.

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In an ap first term is last number is 29 sum of term 155 find the common difference of ap

Posted by Rishabh Kumar 6 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

In the given AP
a=2, l =29 and S_n=155
We know that
Sum of n terms = S_n={tex}\frac{n}{2}{/tex}(a+l)=155
{tex}\therefore{/tex} {tex}\frac{n}{2}{/tex}(2+29)=155
{tex}\mathrm n=\frac{155\times2}{31}=10{/tex}
{tex}\text{Now l=a+(n-1)d}{/tex}
or 29=2+(10-1)d
29=2+9d
29-2=9d
27 = 9d
d = 3

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Sin2A =2sinA when A =?

Posted by Shristi Siddharath 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Aditya Singh 7 years, 6 months ago

0°

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Prove that 7-2*3 is an irrational number.

Posted by Shweta Shah 6 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

let us assume that {tex}\sqrt 3{/tex} be a rational number.
{tex}\sqrt { 3 } = \frac { a } { b }{/tex}, where a and b are integers and co-primes and b{tex} \neq{/tex}0
Squaring both sides, we have
{tex}\frac { a ^ { 2 } } { b ^ { 2 } } = 3{/tex}
or, {tex}a ^ { 2 } = 3 b ^ { 2 }{/tex}--------(i)
a² is divisible by 3.
Hence a is divisible by 3..........(ii)
Let a = 3c ( where c is any integer)

squaring on both sides we get
(3c)² = 3b²
9c² = 3b²
b² = 3c²
so b² is divisible by 3
hence, b is divisible by 3..........(iii)
From equation(ii) and (iii), we have
3 is a factor of a and b which is contradicting the fact that a and b are co-primes.
Thus, our assumption that {tex}\sqrt 3{/tex} is rational number is wrong.
Hence, {tex}\sqrt 3{/tex} is an irrational number.
Let us assume that 7 - 2{tex}\sqrt 3{/tex} is a rational number
7 - 2{tex}\sqrt 3{/tex} = {tex}\frac { p } { q }{/tex} (q {tex}\neq{/tex}0 and p and q are co-primes)
{tex}\style{font-family:Arial}{\begin{array}{l}7-2\sqrt3=\frac pq\\-2\sqrt3=\frac pq-7\\2\sqrt3=7-\frac pq\\2\sqrt3=\frac{7q-p}q\\\sqrt3=\frac{7q-p}{2q}\end{array}}{/tex}
Here 7q-p and 2q both are integers, hence {tex}\sqrt 3{/tex} is a rational number.
But this contradicts the fact that {tex}\sqrt 3{/tex} is an irrational number.
This contradict is due to our assumption that {tex}\style{font-family:Arial}{7-2\sqrt3}{/tex} is rational.
Hence, 7 - 2{tex}\sqrt3{/tex} is irrational.

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2x square - (1+2root2)+2

Posted by Sukesh Vinith 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Deepak Yadhav 7 years, 6 months ago

Mere question ka answer to do

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students were standing in rows for p.t exercise. If 10 students were standing in each rows,3 more rows were required and if 10 more students were standing in each rows, then the number of rows were reduced by 2. Find the number of students.

Posted by Khushi Naik 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

S.Md Sameer 7 years, 6 months ago

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how to draw graph of an qudratic

Posted by Priyanka Lalwani 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sunil Kumar 7 years, 6 months ago

You dont know

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2017 class 10 questions paper hai bhai

Posted by Jeet Narayan 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

Check Question Papers here : <a href="https://mycbseguide.com/cbse-question-papers.html">https://mycbseguide.com/cbse-question-papers.html</a>

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If sin A+B=1 and sin A-B=1/2 or 0<or =A+B where A is greater than B

Posted by Priya Naveen 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Priya Naveen 7 years, 6 months ago

Sin 90 degree is 1and sin 30 degree 1/2 so this implies A+B=90 degree and A-B=30 degree then by 90-30=60 SO A=60,and 60-30=30 SO B=30

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Which book we should prefer for maths for extra questions??

Posted by Vanshika Sachdeva 7 years, 6 months ago

CBSE > Class 10 > Mathematics

9 answers

Rahul Rahul 7 years, 6 months ago

You can buy examidea for extra question.This is avilable in all subject.

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Sunil Maurya 7 years, 6 months ago

You have to give priority first to science and after that R.S Agrawal

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Vaibhav Badhani 7 years, 6 months ago

Comprehensive is bst

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Sakshi Sehgal 7 years, 6 months ago

I think u should more focus on ncert at first

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Srishti Pandey 7 years, 6 months ago

Lakhmir Singh

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Ashish ™ 7 years, 6 months ago

First prefer NCERT.... In Secondary u can use... RD Sharma, Rs Agrwal, ncert exampler or Xam Idea

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Manya Tomar 7 years, 6 months ago

RD sharma and RS Agrawal both were best You can choose anyone

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Anubhav Ranjan 7 years, 6 months ago

Rs aggarwal

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Deva Priya 7 years, 6 months ago

Rd Sharma

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Find the hcf of 95and 190

Posted by Aman Bhatt 7 years, 6 months ago

CBSE > Class 10 > Mathematics

4 answers

Vaibhav Badhani 7 years, 6 months ago

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Vedant Patel 7 years, 6 months ago

Hcf = 95 only As 95×2=190

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Srishti Pandey 7 years, 6 months ago

Using Euclid division lemma — a=bq+r 190=95×2+0 Your HCF is 95

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Pushpendra Kishor 7 years, 6 months ago

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Express 23150. as product of prime factors.

Posted by Aman Bhatt 7 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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Find the HCF of (2cube×3square × 5),(2square× 3cube× 5square) and 2ke upar 4×3×5ke upar cube×7)

Posted by Aman Bhatt 7 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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If two positive integers p and q can be expressed as p=a ke upar cube or b ke upar square kuch aise p= a3b2 and q=akhali h b ke upar cube c ke upar squre kuch aise q= ab3c2 ,a,b,c being prime no , then what is lcm of p and q?

Posted by Aman Bhatt 7 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

p = a³b² and q = ab³c²
LCM(p, q) = ab²

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What is the probability to obtain 100 marks in board maths paper

Posted by Nisha Sajanani 7 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Vaibhav Badhani 7 years, 6 months ago

1/100

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Nisha Sajanani 7 years, 6 months ago

Where is the ans

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(a/b)-(b/y)=0 ; [a( b^2)]/x + [(a^2)b]/y = a^2 + b^2 Solve......

Posted by Gayathri J S 7 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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What is the probability to obtain a two digit number multiple of 5 from no 1 to 100

Posted by Nisha Sajanani 6 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

Total number from 1 to 100 = 100
Two digit numbers that are multiple of 5 = {10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95} = 18
P(Two digit number multiple of 5 from 1 to 100) = {tex}\frac{18}{100} = \frac{9}{50}{/tex}

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If least prime factor of a is 3 and the least prime factor of b is 7 , what is the least prime factor of (a+b)

Posted by Aman Bhatt 6 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

Least prime factor of {tex}"a"{/tex} is {tex}3{/tex} and least prime factor of {tex}"b"{/tex} is {tex}7{/tex}
Therefore, sum of least prime factors of {tex}a\ and\ b = 3+7 = 10{/tex}
and least factor of {tex}10\ is\ 2{/tex}
Therefore, least factor of {tex}a + b{/tex} is also {tex}2{/tex}

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After how many places will the decimal expansion. Of 147/120 terminate

Posted by Aman Bhatt 7 years, 6 months ago

CBSE > Class 10 > Mathematics