Math, asked by pavan14395, 9 months ago

find the sum of first 20 terms of ap 3,7,11,15.....ans is 820

Answers

Answered by hayarunnisamuhammedp

5

Answer:

a=3

d=4

n=20

Step-by-step explanation:

Sn= n/2 (2a +(n-1)d)

=20/2 (2×3 +(20-1)4)

=10 (82)

= 820

Step-by-step explanation:

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Answered by ngachime

0

Answer:

it's 7488889383838884848383838384848

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