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Maths

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Querist : Anonymous

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Querist : Anonymous (Querist)
03 November 2011 The sum of all natural numbers between 100 and 1000 which are multiple of 5 is?

how to calculate?
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Mohan Verma

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Mohan Verma (Expert)
04 November 2011 first term is 105
last term is 995

Nth term is 995
so

105+(n-1)5=995
n=179

Sum of 179 terms of AP=179/2(2*105+178*5)
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