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From 4 senior and 5 junior students, in how many ways can 2 senior and 1 junior student be selected?

Answer and explanation

Correct answer: 30

This is a combination problem because only the members selected matter; their order within the senior group or junior group does not matter. Choose 2 of the 4 senior students in C(4,2) = 4!/(2!2!) = 6 ways. Independently, choose 1 of the 5 junior students in C(5,1) = 5 ways. By the multiplication principle, every senior selection can be paired with every junior selection, so the total is C(4,2) × C(5,1) = 6 × 5 = 30. Therefore option C is correct. Options A, B, and D result from incorrectly adding groups or using an inappropriate ordered-selection calculation.

Related tags

CombinationsSelectionMultiplication PrincipleClass11Permutations And CombinationsMathematicsClass 11 Mcq

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