Question

consider arithematic sequence 4n+3 (a) what sum first 20th term​

Answer 1

Answer:

Given : General term of AP :- 4n+3

To Find : Sum of first 20 terms .

Procedure :

The first term of AP is - 4(1)+3 = 4+3 =7

The 20th term of AP is - 4(20)+3 = 80+3 =83

The sum of 20 terms will be given by the formula - n/2(a+l)

20/2 ( 7 +83 ) = 90(10) 900.

Hence , Answer is 900.