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How many two-digits numbers are divisible by 3?

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How many two-digits numbers are divisible by 3?
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The two-digit numbers divisible by 3 are 12, 15, 18, ..., 99. 

Clearly, these number are in AP. 

Here, a = 12 and d =15 -12 = 3 

Let this AP contains n terms. Then,

Hence, there are 30 two-digit numbers divisible by 3.

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