cards marked with numbers 1,2,3,......,40 are placed in a box and mixed thoroughly. one card is drawn at random from the box. find the probability that the number on the drawn card is a) divisible by 3 and 5 b) a prime number c) a perfect square

a)favourable outcomes of a no. divisible by 3 and 5 = 2
probability = 2/40 = 1/20

b)favourable outcomes of a prime no. = 12
probability = 12/40 = 3/10

c))favourable outcomes of a perfect square = 6
probability = 6/40 = 3/10
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