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Question: If \(12P_{r} = 1320\), then r is equal to....

If 12Pr=132012P_{r} = 1320, then r is equal to.

A

5

B

4

C

3

D

2

Answer

3

Explanation

Solution

Since 12P3=1320;∴r=312P_{3} = 1320;\therefore r = 3.