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What is the value of 5P1?

Answer and explanation

Correct answer: 5

The governing concept is permutation notation. In general, nPr represents the number of ordered selections of r objects from n distinct objects, and nPr = n!/(n−r)!. Substituting n=5 and r=1 gives 5P1 = 5!/(5−1)! = 5!/4!. Since 5! = 5 × 4!, the 4! cancels and the result is 5. This also has a direct counting interpretation: one object can be selected from five distinct objects in five ways, and arranging one selected object adds no further choice. Therefore option A is correct. Option B confuses the result with a single arrangement or with 0!, while 10 and 25 do not follow the permutation formula.

Related tags

PermutationsPermutation FormulaFactorialsPermutations And CombinationsMathematicsClass 11 Mcq

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