2025 · Standard · Set 5 · Part 1·Q24·2 marks
Triangles
Question
In a pre-primary class, a teacher put cards numbered to 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.
Approach
Total cards = 40. Primes from 20–59 are 23,29,31,37,41,43,47,53: 9 primes, . Perfect squares are 25, 36, 49: 3 squares, .
Step-by-step working
- 1
Count prime numbers: 9 primes in 40 cards
1 mark - 2
Count perfect squares: 3 in 40 cards
1 mark
Concepts used
probabilityprime numbersperfect squarescounting
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