Q. 12

# 20 cards are numbered from 1 to 20. One card is drawn at random. What is the probability that the number on the card is(i) a multiple of 4 (ii) not a multiple of 6.

From 1 to 20, number of numbers divisible by 4 = 5

Total no of outcomes = 20

(i) probable outcomes of numbers divisible by 4 = 5

probability  (ii) no of numbers divisible by 6 = 3

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A jar contains 54 marbles each of which is in one of the colours blue, green and white. The probability of drawing a blue marble is and the probability of drawing a green marble is . How many white marbles does the jar contain?