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Find the number of ways of arranging 'r'...

Find the number of ways of arranging 'r' things in a line using the given 'n' different things in which atleast one thing is repeated.

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The correct Answer is:
`=n^(r )-""^(n)P_(r)`
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-PERMUTATIONS AND COMBINATIONS-TAXTUAL EXERCISES
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