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Q.

If 6 letters are placed at random in 6 addressed envelops. Then the odds in favour of arranging them such that no letter goes into correct envelope is

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a

53:91

b

91:53

c

97:64

d

64:97

answer is A.

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Detailed Solution

P(E)=1−11!+12!−13!+14!−.....+16!             =53144 P(E¯)=91144 P(E):P(E¯)=53:91
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