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Q.

There are 6 letters and 6 addressed envelops. If the letters are put at random in the envelops, the probability that atleast one letter may be placed in wrongly addressed envelope is

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a

119120

b

120343

c

1720

d

719720

answer is D.

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Detailed Solution

= 1− Probability for right arrangement= 1− 16P6=720−1720=719720
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