Question

how many of three digit natural number are divisble by 5​

Answer 1

Answer:

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

Answer 2

Three digit number are 100,105...995

a=100 (a= first term)

d=105−100=5 (d=common difference)

⇒a

n

=a+(n−1)d

⇒995=100+(n−1)5

⇒995−100=(n−1)5

⇒

5

895

=n−1

⇒179=n−1

⇒n=179+1

⇒n=180

Hence,

180 three digit natural number are divisible by 5.