If 2n–1Pn : 2n+1Pn–1, = 22 : 7, find n.
To find: the value of n
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
2n–1Pn : 2n+1Pn–1, = 22 : 7
n = 10, -0.42
Since n cannot be -0.42
Hence, value of n is 10.
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