Question

in an Ap given , a=2 , d=8 , sn = 90 . find n and an​

Answer 1

Answer:

s=a +(n-1)d

• 90=2+(n-1)8
• 88/8=n-1
• 11+1=n
• n=12

an=a12=a+11d

=2+11×8

=90