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in how many ways 6 letters can be placed in 6 envelopes such that at least 4 letters go into their corresponding envelopes ?
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Exactly 4 in correct place = 6C4 * D2 = 15

Exactly 5 in correct place = 6C5 * D1 = 6

Exactly 6 in ocrrect place = 1

Total no of ways = 22

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