Permutations And Combinations

Question
CBSEENMA11014143

(a) How many 4-digit numbers are there without repetition of digits?

(b) How many 4-digits are there, if there is no restriction on repetition of digits?

(c) How many 4-digit numbers are there with at least one number repeated?

Solution

Solution not provided.
Ans. (a) 4536
       
       (b) 9000
       (c) 4464
 

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