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## Answers

**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**