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What percenta...

Question

What percentage of numbers from $1$ to $30$ has $1$ or $9$ in the unit's digit?

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Solution

Such numbers from $1$ to $30$ are $1, 9, 11, 19, 21, 29$
Number of such numbers $= 6$

Required percentage is $\frac{6}{30} \times 100$ % = $20$ %

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