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Question

# A ball is drawn at random from a box containing 10 red, 30 white, 20 blue and 15 orange marbles. The probability of a ball drawn is red, white or blue .......

A
13
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B
35
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C
23
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D
45
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Solution

## The correct option is D 45Total number of balls in the box, n(S)=10+30+20+15=75Number of red balls, 10Number of white balls, 30Number of blue balls, 20Hence the number of favourable outcomes for getting a red, white or blue ball is, n(E)=10+30+20=60Hence the probability of a ball drawn is red, white or blue is, n(E)n(S)=6075=45

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