Q. 65.0( 3 Votes )

# If 15P

Answer :

To find: the value of r

Formula Used:

Total number of ways in which n objects can be arranged in r places (Such that no object is replaced) is given by,

nPr

15Pr–1 : 16Pr–2, = 3 : 4

Since r cannot be 21 as it creates a negative factorial in denominator. Therefore,
is not possible.

Hence, value of r is 14

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