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In a stage program, 5 students are available for the first speaker and the remaining students are available for the second speaker. The same student cannot speak twice. How many ordered selections are possible?

Answer and explanation

Correct answer: 20 selections

The governing idea is the multiplication principle with ordered choices. There are 5 possible choices for the first speaker. Once that student is selected, four students remain available for the second speaking position because repetition is not allowed. Therefore, the number of ordered selections is 5 × 4 = 20. The order matters: choosing student X first and student Y second is different from choosing Y first and X second. Thus option D is correct. The answer 10 would treat the pair as unordered, which is unsuitable for separate first and second positions. The value 25 incorrectly allows the first student to speak twice, and 15 does not follow the required two-stage count.

Related tags

Permutations-CombinationsOrdered-SelectionFundamental-Principle-CountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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