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How many ways are there to choose 2 digits from 6 digits if order is not considered?

Answer and explanation

Correct answer: 15

The governing idea is combination, since the question explicitly says that order is not considered. Choose 2 objects from 6 by using 6C2 = 6!/(2!4!). This becomes (6×5)/(2×1) = 30/2 = 15, so option B is correct. For example, choosing digits a and b is the same selection as choosing b and a; they must not be counted twice. Option A is only 6×2 and does not apply the combination rule. Option C is the un-divided product 6×5, which counts both orders. Option D, 6², represents a different type of ordered choice with repetition allowed, not this selection problem.

Related tags

CombinationsClass11Order-Independent-SelectionPermutations And CombinationsMathematicsClass 11 Mcq

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