Math, asked by Balor0123, 1 year ago

the sum of 8th & 17th term of an AP is 36 find the sum of first terms of the AP

JessiJ: R u sure this is your question

Balor0123: yep

JessiJ: Sum of first ( how many terms

Balor0123: 24

JessiJ: Ok now got it

Balor0123: answer

JessiJ: Is there any answer given

Answers

Answered by thamizhvendhan

this is correct but this is incomplete so not able to do the other steps
pls resend the question correctly

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Balor0123: galat hai tera

Answered by JessiJ

T8 =a+(8-1)d

T8=a+7d

Similarly

T17 = a+16d

T8+T17 =36 (given)

Substitute the above values

(a+7d) + (a+16d) =36

2a + 23d =36.......eq 1

Sn=n/2(2a+(n-1)d)

S24 = 24/2(2a + (24-1)d)

S24 = 12(2a +23d)

From eq 1 that is 2a +23d =36 substitute

S24 = 12 × 36

S24 = 432

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