Question

find the sum of first 30 to terms of AP 5 + 8 + 11 +​

Answer 1

Answer:

we know that sum of nth term is--

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

a=5

d=8-5=3

nth term=30

s=30/2(2(5)+29(3))

s=15(10+87)

s=15(97)

s=1455

so,sum of 30 terms of ap is 1455.

ans............