Question

How many two - digits no. are dividible by 3

Answer 1

I think that the following solution will help you.

Answer 2

here is your answer..

$two \: digit \: numbers \: divsible \: by \: 3 = = 12.15.18.............99 \\ a = 12 \\ d = 3 \\ a(n) = 99 \\ n = t o\: find \\ a(n) = a + (n - 1)d \\ 99 = 12 + (n - 1)3 \\ 99 - 12 = 3n - 3 \\8 7 + 3 = 3n \\ 3n = 90 \\ n = 30 \\ \\ hence \: 30 \: two \: digit \: numbers \: are \: divisible \: by \: 3$

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