In a pre-primary class, a teacher put cards numbered 20 to 59 in a bowl. A student picked up a card at random and read…

CBSE Class 10 Maths PYQ · Probability · Reverse question of probability · 2 Marks · March 2025 · Basic

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992 Marks · March 2025 · Basic
In a pre-primary class, a teacher put cards numbered $20$ to $59$ in a bowl. A student picked up a card at random and read the number. Find the probability that the number read was (i) a prime number (ii) a perfect square.
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Total number of cards $= 40$
(i) $P(\text{a prime number}) = \frac{9}{40}$
(ii) $P(\text{no. is perfect square}) = \frac{3}{40}$
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