Permutations And Combinations

Question
CBSEENMA11014047

How many 4-letter code can be formed using the first 10 letters of the English alphabet, repetition of letters is (a) allowed (b) not allowed?

Solution

Solution not provided.
Ans. (a) 10000  (b) 5040

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Some More Questions From Permutations and Combinations Chapter

Determine K, so that K + 2, 4K – 6 and 3K – 2 are three consecutive terms of an A.P.