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Probability questions - an easy one and a hard one:

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Question #1: If 2 letters are written and the corresponding envelopes addressed, and the letters are then fitted at random into the envelopes, the probability that both letters will go into wrong envelopes is ____?

Question #2: If 13 letters are written and the corresponding envelopes addressed, and the letters are then fitted at random into the envelopes, the probability that the 13 letters will go into wrong envelopes is ____?

posted Nov 6, 2016 by George Davros

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1 Answer

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Question #1 => {1/2}×{1/2} = 0.25. ie., 25% chance of that happening.
Question #2 => {12/13}×{12/13}×..... (11 more times) ={12/13}^13 = 0.3532
ie., 35.32% of that happening.

answer Nov 7, 2016 by Tejas Naik



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