Question

8. How many three digit natural
numbers are divisible by 5?


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Answer 1

Answer:

The first three digit natural number divisible by 5 is 100. Hence, there are 180 three digit natural numbers divisible by 5.

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Answer 2

Answer:

Three digit number are 100,105.........995

a=100                            (a= first term)

d=105−100=5         (d=common difference)

⇒an=a+(n−1)d⇒995=100+(n−1)5⇒995−100=(n−1)5⇒5895=n−1⇒179=n−1⇒n=179+1⇒n=180

Hence,

180 three digit natural number are divisible by 5.