NIMCET 2013 Question Paper with solutions

Question : 41 of 120

Marks: +1, -0

The sum of integers between 200 and 400. that aremultiples of 7 is

Solution:

First term multiplied by 7 in between 200 and 400, is 203.

∴203+210+...+399

[∵last term = 399]
There are

{399-203}/7+1=29

terms in the series.
∴ Sum of 29 terms

={203+399}/2×29=8729

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