Question

for an AP the first and last term 13 and 216 respectively common difference is 7 how many terms are there in the AP find the sum of all the terms

Answer 1

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Answer:

3435

Step-by-step explanation:

a = 13

& l= 216

216 = 13 + (n-1) 7

(n-1) 7 = 203

n-1 = 29

n = 30

sn = n/2(a+l)

= 15(13+216)

= 15×229

= 3435

Hope it helps u.

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