A Number is selected at random from first thirty natural numbers. What is the chance that it is a multiple of either 3 or 13?

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Solution

The correct option is B
Total sample space is 30

The number of multiples of 3 are 10 and the number of multiples of 13 are 2, out of which none of them are common.
Hence, answer is $\frac{2}{5}$

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