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Subjects
Class 11MathematicsPermutations and CombinationsCombinationsHard
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From (13) friends (6) are to be selected for a trip and at least one of (5) special friends must go. How many ways are there?

Answer and explanation

Correct answer: (1688)

Total ways are (\binom{13}{6}=1716) and if no special friend goes then (\binom{8}{6}=28). Hence (1716-28=1688).

Related tags

CombinationsClass11HardPermutations And CombinationsMathematicsClass 11 Mcq
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