Derangement

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[anuragnayak]

Exactly two letters are correctly placed : We need to select 2 correct letters out of 5 letters... So this can be done in C(5, 2) ways. Finally 3 remaining letters can be arranged in 3! ways... So total number of ways in which exactly 2 letters are correctly placed is : C(5, 2) * 3! = 60 ways...

[ganeshKiD]

Sir u r really genious mera shadio purana doubt clear ho gaya