Math, asked by pasunurisampath6, 6 months ago

Test Name-002092020P
find the sum of first 20 terms of the following series
4,8,12,16,20,24,28..........
640

Answers

Answered by kaushalprakash1289

1

Answer:

a=4

d= 8-4=4

now,

s20= 20/2(2*4+19*4)

=10(8+76)

=10*84

=840

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