Math, asked by chethand657, 11 months ago

find the sum of the 20 terms of 5+10+15

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Answered by mohan130150

4

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Answered by aqawi317

0

Answer:

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

n=20, d= 10-5=5, a=5

S20= 10(10+19×5)

= 10(95+10)

=10×105

=1050

S20 = 1050

hope it helps.....

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