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A stationery set has (4) file colors and (7) label colors. In how many ways can one file color and one label color be chosen?

Answer and explanation

Correct answer: (28) ways

The governing concept is the fundamental principle of counting, also called the multiplication rule. The selection has two successive and independent stages: first choose one file color, and then choose one label color. The file color can be selected in 4 ways. For each of these 4 choices, any of the 7 label colors can be paired with it, so each file-color choice creates 7 complete pairs. Therefore, the total number of distinct choices is 4 × 7 = 28. Option B is correct. Adding 4 and 7 gives 11, but addition is appropriate for alternatives, not for completing both selections. Options C and D do not equal the required product.

Related tags

Fundamental Principle Of CountingMultiplication RuleColor CombinationsPermutations And CombinationsMathematicsClass 11 Mcq

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