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JEE MATHEMATICS MCQ: PERMUTATIONS

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Analyzing +4 | -1

{ }^1 \mathrm{P}_1+2 .{ }^2 \mathrm{P}_2+3 .{ }^3 \mathrm{P}_3+\cdots+n .{ }^n \mathrm{P}_n

is equal to

View answer and explanation

Correct option: B

{ }^{n+1} \mathrm{P}_{n+1}-1

The correct answer is B (

{ }^{n+1} \mathrm{P}_{n+1}-1

) because the given sum can be simplified to a telescoping series of factorials.

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