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Class 11MathematicsPermutations and CombinationsCombinationsExpert
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From (12) persons, (5) are to be selected, but two particular persons must not be selected together. How many selections are possible?

Answer and explanation

Correct answer: (672)

From total ( \binom{12}{5} ), subtract ( \binom{10}{3} ) selections containing both particular persons, giving (672). For not-together conditions, subtract forbidden cases.

Related tags

Class11CombinationsRestrictionNot-TogetherExpertPermutations And CombinationsMathematicsClass 11 Mcq
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