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OpenStudy (anonymous):
there are 7 letters and 7 envelopes . find the probability that no letter reaches its correct address???
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Parth (parthkohli):
Hint: probability that no letter reaches the correct address = probability that all letters reach the wrong addresses.
OpenStudy (anonymous):
is it related to derangement ????
Parth (parthkohli):
Letter 1 has 6 ways it could go to a wrong place. Letter 2 has 5 ways because one letter has already been delivered. Letter 3 has 4. Letter 4 has 3. ... and so on
OpenStudy (anonymous):
Yes....Permutation and combination..u have to use this
OpenStudy (anonymous):
@ParthKohli then it will be like |dw:1346340930218:dw| is it right ???
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OpenStudy (anonymous):
no....))
OpenStudy (anonymous):
|dw:1346340994607:dw|
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