Q20 of 84 Page 5

Find the number of all three-digit natural numbers which are divisible by 9. (CBSE 2013)

Let the three digit numbers divisible by 9 are

108, 117, 126,… ,999


a=108, d=9, last term, l= 999


Number of terms, n = +1


= + 1


= +1


=100


Hence, the number of all three digit natural numbers which are divisible by 9 are 100

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