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A word of 6 letters is formed from a set...

A word of 6 letters is formed from a set of 16 different letters of English alphabet (with replacement). Find out the probability that exactly two letters are repeated.

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FIITJEE-MATHEMATICS TIPS-NUMERICAL DECIMAL BASED QUESTIONS
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  21. Let vec a , vec b a n d vec c be three vectors having magnitudes 1...

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