Math, asked by soo1, 1 year ago

find the sum of all multiples of 7 lying between 500 and 900

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Answered by shanti22

A.P. = 504,511,.............,896 which multiples of 7 then, An= A +(n-1) xd == 896=504 +(n-1) x7 then we get, n=57 Sn=n/2 (A+An) == 57/2(504+896) then, Sn= 39900

Answered by cpshukla96

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