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In a club (6) students are available for president and the same (6) students are available for secretary. The same student cannot hold both posts. How many appointments are possible?

Answer and explanation

Correct answer: (30) नियुक्तियां

This uses the fundamental principle of counting with a restriction. First choose the president: there are 6 possible students. After that appointment, the selected student cannot be secretary, so only 5 students remain eligible for secretary. Because the posts are different, choosing student X as president and student Y as secretary is different from the reverse assignment; therefore we multiply rather than divide by 2. The total is 6 × 5 = 30, so option C is correct. Option A incorrectly allows the same student to occupy both posts, option B adds choices instead of multiplying, and option D corresponds to an unrelated combination count.

Related tags

Fundamental-Principle-Of-CountingRestricted-AppointmentsPermutationsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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