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A card is drawn at random from a pack of $50$ cards numbered $1$ to $50$. Find the probability of drawing a number which is a perfect square.
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Favourable outcomes are $1, 4, 9, 16, 25, 36, 49$
$\therefore P(\text{Perfect square} < 50) = \frac{7}{50}$
$\therefore P(\text{Perfect square} < 50) = \frac{7}{50}$