Sunday 30 June 2013

Find the sum of all natural numbers lying between 100 and 1000, which are multiples of 5.

Find the sum of all natural numbers lying between 100 and 1000, which are multiples of 5.

Answer

The natural numbers lying between 100 and 1000, which are multiples of 5, are 105, 110, … 995.
Thus, the sum of all natural numbers lying between 100 and 1000, which are multiples of 5, is 98450.

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