https://www.letsrun.com/forum/flat_read.php?thread=12983514&t=1724434541#post-1
No of ways in which the 3 correct envelopes can be selected= 7C3 =35 Derangement of the remaining 4 envelopes & letters = 9 (derangement value for 4 is 9) Total No of ways of arrangement = 9 x 35= 315. Example 2: In how many ways can you form a dancing couple from 3 boys and 3
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