Question

Given a is equal to 2 is equal to 8 is equal to 90 find n and a n

Answer 1

Answer:

n=12

Sn=552

hope it helps you thanks

Step-by-step explanation:

a =2 d=8 an =90

an = 90= 2+(n-1)8 (a+(n-1)d

88/8=n-1 n=12

Sn = n/2(a+l)

Sn=12/2(2+90) 92×6=552