Math, asked by theyoungprateek, 1 year ago

find the sum of 25 + 28 + 31 .....100

Answers

Answered by Anonymous

11

an=100

a=25

d=3

thus,

an=a+(n-1)d

100=25+(n-1)3

75=3n-3

3n=78

n=26

thus

S26= (a+an)n/2

=(25+100)13

125×13

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