(i) Favourable cards are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, i.e., 10.
P (prime number less than 30) = 10/100 or 1/10
(ii) Favourable cards are 35, 70.
P (card is a multiple of 5 and 7) = 2/100 or 1/50
(iii) Favourable cards are 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 7,14, 21, 28, 42, 49, 56, 63, 77, 84, 91, 98 i.e., 32 P(card is a multiple of 5 or 7) = 32/100 or 8/25.