Question

(1) A box contains 40 identical cards numbered cards numbered from 1 to 40 . A card is chosen at random . Find the probability that the number of chosen card is : a) odd and divisible by 5 b) Prime number c) divisible by 3 and odd number

Answer 1

ans a)

no divisible by 5 are 5, 10,15,20,25,30,35,40
odd = 4/40

ansb) prime numbers = 1,2,3,5,7,11,13,17,19,23,29,31,37

probability = 13/40

ans c) divisible by 3 = 3,6,9,12,15,21,24,27,30,33,36,39

odd = 7/40


thanksfor asking