Permutation and CombinationHard
Question
Six married couple are sitting in a room. Number of ways in which 4 people can be selected so that there is exactly one married couple among the four is:
Options
A.240
B.255
C.360
D.480
Solution
First we select one married couple out of 6 married couple i.e.
6C1 ways
total number of required case
6C1 × 5C1 × 4C1 × 2 = 6 × 5 × 4 × 2 = 240
6C1 ways
total number of required case
6C1 × 5C1 × 4C1 × 2 = 6 × 5 × 4 × 2 = 240
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