Answers

2016-02-23T23:55:17+05:30
Multiple of 7 lying between 500 and 900 are 504,511,518,525,....,896
a = 504,an = 896,d = 7,n = 896 - 504 = 392
Sn = n/2{2a + (n - 1)d}
      = 392/2{ 2 * 504 +(391 * 7)}
      = 166{1008 + 2737}
      = 166 * 3745
      = 621670
Sum Of All Multiples Of & Lying Between 500 and 900 = 621670

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  • Brainly User
2016-02-24T00:01:35+05:30
First term=504 and last term=896..and d=7...so 896=504+7n-7=>n=57..so sum of all the multiples=57/2*(504*2+56*7)=57/2*1400=39900
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