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Two pictures are to be selected from 6 pictures for a poster. How many selections are possible?

Answer and explanation

Correct answer: 15

The governing concept is combination because the question asks for selections, not an arrangement of the chosen pictures in named positions. Choose 2 pictures from 6 using 6C2 = 6!/(2!4!) = (6×5)/(2×1) = 15. Therefore option B is correct. A selection containing pictures P and Q is the same as one written Q and P, so reversing their order must not create a new selection. Option A does not follow the combination formula. Option C is the un-divided product 6×5 and therefore counts both orders of each pair. Option D, 6², represents ordered choices with repetition in a different model. If the poster had two distinct positions, an arrangement count would be needed, but no such positions are specified.

Related tags

CombinationsPicture-SelectionOrder-IndependentClass11Permutations And CombinationsMathematicsClass 11 Mcq

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