Question

find s30 first term of an AP 10 and common difference is 5​

Answer 1

Step-by-step explanation:

Given that,

First term (a)=10

Common difference (d)=5

n=30

s30=2a+(n-1)d

=2(10)+(30-1)(5)

=20+29(5)

=20+145

=165

Hence s30=165

I hope this answer may help you

Answer 2

Answer:

3) Find S3o when first therm in 10 and last term is 240