Four digit numbers are formed from the d...

Four digit numbers are formed from the digits = [4 = 1, 2, 4, 5, 7, 8 (without repetition of digits).
Q How many numbers can be formed.

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The correct Answer is:

120

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PREMIERS PUBLISHERS-COMBINATORICS AND MATHEMATICAL INDUCTION-PROBLEMS FOR PRACTICE (Choose the correct option for the following)

Four digit numbers are formed from the digits = [4 = 1, 2, 4, 5, 7, 8 ...
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0! Is :
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