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If Sn denotes the sum of first nth terms of an AP. Prove that S12=3(S8-S4).

Posted by Sakshi Sharma 1 day, 19 hours ago

1 answers

Saksham Hinge 1 day, 18 hours ago

Let 1 s t term of A . P = a and common difference = d We have to prove that S 12 = 3 ( S 8 − S 4 ) S 12 = 12 2 [ 2 a + ( 12 − 1 ) d ] S 8 = 8 2 [ 2 a + ( 8 − 1 ) d ] S 4 = 4 2 [ 2 a + ( 4 − 1 ) d ] Now, R . H . S = 3 ( S 8 − S 4 ) = 3 [ 8 2 ( 2 a + ( 8 − 1 ) d − 4 2 ( 2 a + ( 4 − 1 ) d ] = 3 [ 8 x + 28 d − 4 a − 6 d ] = 6 ( 2 a + 11 d ) = 12 2 [ 2 a + ( 12 − 1 ) d ] = S 12 = L . H . S

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If the sum of the first Pth term of an AP is the same as the sum of it's first Qth term (p≠q).then,show that the sum of it's first p+q terms is 0.

Posted by Sakshi Sharma 1 day, 19 hours ago

CBSE > Class 10 > Mathematics

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Accord of circle of radius 10 cm subtends a right angle at the centre find the area of the corresponding minor segment and major sector

Posted by Varsha Verma 1 day, 23 hours ago

CBSE > Class 10 > Mathematics

1 answers

Lucky Ahirwar 1 day, 21 hours ago

And

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Anyone want to give maths challenge chapter ap Code-43715760872

Posted by Usha Subhash 2 days, 19 hours ago

CBSE > Class 10 > Mathematics

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Ex 1.2 questions no. 4

Posted by Nishita Narwat 2 days, 20 hours ago

CBSE > Class 10 > Mathematics

2 answers

Sakshi Sharma 1 day, 19 hours ago

Given: HCF of two numbers 306 and 657 is 9 To find: LCM of number We know that, LCM x HCF = first number x second number LCM x 9 = 306 x 657 LCM=306x 6579 =22338

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Ansh Gupta 2 days, 19 hours ago

Hey Nisha where is fourth question of 1.2 exercise. Are you joking.

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Prove sinA =cosecA

Posted by Hfghfyh Gfyhh 3 days, 7 hours ago

CBSE > Class 10 > Mathematics

1 answers

Jagmohan Singh 3 days, 5 hours ago

There's something wrong in your question As SinA = 1/CosecA

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Find the area of the circle

Posted by Prachi Lalwani 3 days, 16 hours ago

CBSE > Class 10 > Mathematics

1 answers

Jagmohan Singh 3 days, 5 hours ago

Formula for finding the area of Circle is πr²

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water is flowing at the rate of 15 km per hour through a pipe of diameter 14 cm into a cuboidal tell pond which is 50 m long and 44 m find what time will the level of water in pound rise by 21 CM

Posted by Anshika Singh 3 days, 19 hours ago

CBSE > Class 10 > Mathematics

1 answers

Jagmohan Singh 3 days, 5 hours ago

I can provide you the text solution But I'll recommend you understand it visually You can watch any video or I can send you my video link .

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water is flowing at the rate of 15 km per hour through a pipe of diameter 14 cm into a cuboidal tell pond which is 50 m long and 44 m find what time will the level of water in pound rice by 21 CM

Posted by Anshika Singh 3 days, 19 hours ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

The coordinates of the centre of the circle,o and a point on the circle,N What is the radius of circle

Posted by Anu X 3 days, 20 hours ago

CBSE > Class 10 > Mathematics

0 answers

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1+sec/sec = sin^2A/1-cos

Posted by Anushka Yadav 4 days, 18 hours ago

CBSE > Class 10 > Mathematics

1 answers

Naitik Rajput 4 days, 17 hours ago

1+sec/sec = sin²A/1-cos 1/sec+sec/sec = 1-cos²/1-cos Cos+1=(1-cos)(1+cos)/1-cos Cos +1 =1+cos LHS = RHS

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Find the value of k if k(x-6) +6=0

Posted by Sri Rekha Deep 4 days, 23 hours ago

CBSE > Class 10 > Mathematics

2 answers

Bhavya Jain 4 days, 3 hours ago

there was mistake

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Laxmi Kumari 4 days, 21 hours ago

Hey I guess there's a mistake in your question

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(x, y) is 5 unit from the origin. How many such points lie in the third quadrant?

Posted by Ishant Singh 5 days, 2 hours ago

CBSE > Class 10 > Mathematics

0 answers

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ABCD is a parallelogram. Point P divides AB in the ratio 2:3 and point Q divides DC in the ratio 4:1. Prove that OC is half of OA.

Posted by Rehan Ansari 5 days, 18 hours ago

CBSE > Class 10 > Mathematics

1 answers

Priscilla Joy 5 days, 16 hours ago

1is to 2

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The CM of the lcf and LCM of two natural numbers are 12 and 144 respectively one of the number is 36 the other number is section a mathematics standard sample paper 03

Posted by Usha Subhash 5 days, 21 hours ago

CBSE > Class 10 > Mathematics

2 answers

Dev Barnwal 4 days, 21 hours ago

0Thank You

Aryan Birra 5 days, 19 hours ago

Chapter 8 and 9

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Kisi ne mathematics for class 10th ka challenge banaya hain toh code send karo na please only for mathematics...

Posted by Sankalp Dinesh 6 days, 2 hours ago

CBSE > Class 10 > Mathematics

2 answers

Usha Subhash 5 days, 21 hours ago

47944413943

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Priya Sharma 5 days, 22 hours ago

131109

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if alpha and beta are zeroes of a quadratic polynomial.find the value of alpha^2 + beta^2 and alpha^-1 and beta ^-1

Posted by Shreya Singh 6 days, 16 hours ago

CBSE > Class 10 > Mathematics

1 answers

Sankalp Dinesh 6 days, 3 hours ago

What is the polynomial and how it is raise to the power -1????

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If (-5, 3) and (5, 3) are two vertices of an equilateral triangle, then find coordinates of the third vertex, given that origin lies inside the triangle.

Posted by Divyansh Gupta 6 days, 18 hours ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

The CSA of cylinder is 264cm3 and it's volume is 924m3 than radius, of it's hight to it's diameter

Posted by Bhavana Bhavana 6 days, 21 hours ago

CBSE > Class 10 > Mathematics

2 answers

Sankalp Dinesh 6 days ago

How CSA can be in cm3 and it's ratio instead of radius na??

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Arun Dayma 6 days, 20 hours ago

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In given fig., angle cef = angle cef f is the mid-point of dc prove ab/bd = ae/fd

Posted by Parmit Kumar 1 week ago

CBSE > Class 10 > Mathematics

1 answers

Sankalp Dinesh 6 days ago

Where is the figure??

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Middle term splitting 4x²-4x+1=0

Posted by Kenny Subba 1 week ago

CBSE > Class 10 > Mathematics

1 answers

Abhishek Choudhury 1 week ago

Let p(x)=>4x²-4x+1=0 =>4x²-2x-2x+1=0 =>2x(2x-1)-1(2x-1) =>(2x-1) (2x-1) =>2x-1=0 or 2x-1=0 => x=1/2 or x=1/2 (Answer)

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What is rational numbers between 14 and 976

Posted by Rukmani Yadav 1 week ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

A metal cube of 9 cm is melted and re caste into three smaller cubes . if the edge of two of the smaller cubes are 1 cm and 6 cm find the edge of the third cube

Posted by Shivam Sharma 1 week ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

rael no

Posted by Rishabh Singh 1 week, 1 day ago

CBSE > Class 10 > Mathematics

1 answers

Gurjot Kaur 1 week ago

All rational and irrational numbers ( either positive or negative)

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I want basic sample papers of last 5 years

Posted by Ranjeeta Rani 1 week, 1 day ago

CBSE > Class 10 > Mathematics

1 answers

Abhishek Raghav 1 week, 1 day ago

Last year question paper of science

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Find the probility of getting the following by throw ing dice simultaneosly (1) prime number on both dice (2) number geater than 3 on both the dice

Posted by Satyam Kumar 1 week, 2 days ago

CBSE > Class 10 > Mathematics

2 answers

Divyangana Divyangana 1 week, 2 days ago

(2. Favourable outcome = 9 (4,4) (4,5) (4,6) (5,4) (5,5)(5,6) (6,4) (6,5) (6,6) Possible outcome = 36 POE = 9/36 POE = 1/4

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Mahima Prajapati 1 week, 2 days ago

Favourable outcomes=(2,2)(2,3)(2,5)(3,2)(3,3)(3,5)(5,2)(5,3)(5,5) Possible outcomes=36 P(prime no.on both dice)=9/36=1/4

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CBSE > Class 10 > Mathematics