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