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An exam app has (2) modes, (5) question-count options and (6) time options. How many test setups are possible?

Answer and explanation

Correct answer: (60) setups

The governing concept is the fundamental principle of counting. A complete test setup requires one mode, one question-count choice and one time choice. The mode can be selected in 2 ways. For each mode, there are 5 question-count options, giving 2 × 5 = 10 mode-count combinations. Each combination can be paired with any of the 6 time options. Thus the total number of setups is 2 × 5 × 6 = 60, making option C correct. Option A adds the numbers rather than forming combinations. Option B omits the time factor, and option D is an incorrect product. Since every setup must specify all three independent settings, multiplication is required.

Related tags

Permutations-CombinationsFundamental-Principle-Of-CountingProduct-RuleFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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