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A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is?

A. 8/15
B.2/5
C. 3/5
D. 7/15
Answer and Feedback
Answer:D
Feedback:Drawing two balls of same color from seven green balls can be done in ⁷C₂ ways.
Similarly from eight white balls two can be drawn in ⁸C₂ ways.
P = ⁷C₂/¹⁵C₂ + ⁸C₂/¹⁵C₂ = 7/15

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Practice probability Online Test 1 | Englishfreetest.com

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