Question

Given a=5, d=3,an =50 .find the n and 5n​

Answer 1

Answer:n=10, 5n=50

Explanation:

an=50

n=50/a

n=50/5=10

5n=5×10=50

Answer 2

Explanation:

an = 50

a +(n-1)d = 50

5 + (n-1)*3 = 50

(n-1)*3 = 50 - 5 = 45

n-1 = 45/3

n-1 = 15

n=15+1 = 16

n = 16