Project ForgeEngineering Mathematics
Probability & Statistics
GATE 2020
Medium
A box has 5 green balls and 10 blue balls. A person picks 6 balls randomly. The probability of picking exactly 4 green and 2 blue balls is
- A42/1001
- 45/1001
- C240/1001
- D420/1001
Explanation
P=C(5,4)·C(10,2)/C(15,6)=5×45/5005=225/5005=45/1001.
Source: GATE CH 2020 (2020)
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