Question

in an AP given a=5,d=3,An =50find n and s.
pls do step by step​

Answer 1

Answer:

An = a+ (n-1)d

50= 5+(n-1)3

50=5+3n-3

48=3n => n=16

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

=16/2(10+15×3)

=8×55 = 440