Question

the sum of 20 terms of the AP of the AP, 3, 5, 7

Answer 1

heya

here is ur answer

============================

✴ given first three terms of AP :- 3,5,7

✒ A1 = 3

✒ d = A2 - A1

✒ d = 5-3

➡ d = 2

✒sum of the terms = sn = n/2{2a+(n-1) d

substituting the values in formula v get -

➡ n= 20

✒ S20 = 20/2 { 2*3+(20-1)2}

✒S20 = 20/2 {6+19*2}

➡S20 = 20/2 {6+38}

➡S20 = 20/2 {44}

✒S20 = 20*22

➡S20 = 440

✴✴✴✴✴✴✴✴✴✴✴✴✴✴✴

hence ur answer is 440

================================

hope it helps u..!!

thnkq