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Find the number of 4- digited numbers th...

Find the number of 4- digited numbers that can be formed using the digits 1,2,4,5,7,8 when repetition is allowed.

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The correct Answer is:
when repetition is allowed `=6^(4)=1296`
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-PERMUTATIONS AND COMBINATIONS-TAXTUAL EXERCISES
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  15. The number of 4 digited numbers that can be formed using the digits {0...

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