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Find how many three digit natural numbers are divisible by 5.

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Find how many three digit natural numbers are divisible by 5.

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The three digit natural numbers divisible by 5 are 100, 105, 110, …,995

The above sequence is an A.P.

∴ a = 100, d = 105 – 100 = 5

Let the number of terms in the A.P. be n.

∴ There are 180 three digit natural numbers which are divisible by 5.

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