There are 4 envelopes with addresses and 4 concerning letters. probability that letter does not go i

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14.Probability

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There are $4$ envelopes with addresses and $4$ concerning letters. The probability that letter does not go into concerning proper envelope, is

A

$\frac{{19}}{{24}}$

B

$\frac{{21}}{{23}}$

C

$\frac{{23}}{{24}}$

D

$\frac{1}{{24}}$

Solution

(c) Required probability is $1 – P$ (they go in concerned envelopes)

$ = 1 – \frac{1}{{4\,!}} = \frac{{23}}{{24}}.$

Standard 11

Mathematics

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