The number of circular permutations of 8 things taken 4 at a time in both directions is
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a
720
b
420
c
540
d
35
answer is B.
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Detailed Solution
The number of circular permutations of 8 things taken 4 at a time in both directions is = 8p44=420 The number of circular permutations of n different things taken r at a time in both directions =Pn,rr