Answer :

The three digit natural numbers are from 100 to 999.

The first and last three-digit number divisible by 5 are 105 and 995 respectively.

It is an AP as (105,110,……995)

a_{n} = a + (n - 1)d

⇒ 995 = 105 + (n - 1)5

⇒ 890 = (n - 1)5

⇒ 178 = (n - 1)

⇒ n = 179.

There are 179 three digit natural numbers divisible by 5.

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