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Find the number of numbers of six digits...

Find the number of numbers of six digits that can be formd with the digits 1,2,3,4 if all the digits are to asppear in the same number at least once.

Text Solution

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The correct Answer is:
`4^(6)-.^(4)C_(1)3^(6)-.^(4)C_(2)2^(6)-.^(4)C_(3)`
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