Permutations And Combinations

Question
CBSEENMA11014242

How many 3-digit numbers can be formed without using the digit 0, 2, 3, 4, 5, 6 when:

(a) repetition of digits is not allowed ?

(b) repetition of digits is allowed ?

Solution

Solution not provided.
Ans. (a) 24  (b) 64

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