Question

5) Find the sum of all-natural numbers from 100 to 300 which are
exactly divisible by 4.
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Answer 1

Answer:

The sum of n terms of an AP is S =( n/2)(a+ l) = (9/2)(120+280) =1800. Hence the sum of all the natural numbers between 100 and 300 divisible by both 4 and 5 is 1800.