Question

given a=5, d=3, a, = 50, find n and S.​

Answer 1

Step-by-step explanation:

sorry i cant understand

Answer 2

Answer:

n=16;An=27.5

Step-by-step explanation:

A=5

D=3

An=50

or,A+(n-1)d=50

or,5+(n-1)3=50

or,3n-3=50-5

or,3(n-1)=45

or,(n-1)=15

thus,n=15+1=16

Sn=1/2(A+An)

=1/2(5+50)

=1/2×55

=27.5