Question

7,10,13.... 184;in AP

Answer 1

Hey sup,

a=7.
d=10-7=3.
l=184.

A(n)=a+(n-1)d.
=>184=7+(n-1)3.
=>184-7=(n-1)3.
=>177=(n-1)3.
=>177/3=n-1.
=>n-1=59.
=>n=60.

S(n)=n/2(a+l).
S(60)=60/2(7+184).
S(60)=30×191.
S(60)=5730.

Hope it helps.