Question

For an ap the 1st term and last term is 13 and 216 common difference is 7 how many termas are there in ap find m of all terms

Answer 1

Answer:

n = 30

Step-by-step explanation:

a = 13, d = 7 last term = 216

an = a + (n-1)d

216 = 13 + (n-1)7

216 - 13 = (n-1)7

203 = (n-1)7

n - 1 = 203/7

n - 1 = 29

n = 29 + 1

n = 30

therefore there are 30 terms in the AP

sum of all the terms

Sn = n/2 (a + l)

= 30/2 (13 + 216)

= 15 × 229

= 3435

hope you get your answer