Question

9. Find the sum of first 20 terms of the AP 5, 13, 21,​

Answer 1

Answer:

157

Step-by-step explanation:

a= 5 , d= 8 , n= 20

an = a + (n-1)d

a20 = 5 + (20-1)8

= 5 + (19)8

= 5 + 152

= 157

Answer 2

I hope you correct answer.

and I am pranchal Satyadev pathak