A Question of envelopes

Asked by SSHHII | 27th Jun, 2009, 11:15: PM

Expert Answer:

Three letters each to which corrsponds an adressed envelope are placed in envelopes at random

I letter can be put in any of the three envelopes so 3 ways
letter can be put in any of the remaining 2 envelopes so 2ways

III letter will have only 1 way
So totalnumber of ways in which 3 letters canbe arranged in 3
envelopes =3x2x1= 6  ways
There is only 1 way in which they can be arranged correctly
SoProbability = no. of fav events/totalevents = 1/6

Hope the answer is clear now

Answered by  | 9th Jul, 2009, 09:19: AM

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