How many 3- digit even numbers are forme...

How many 3- digit even numbers are formed using the digits 0, 1, 2, …… 9, if the repetition of digit is not allowed ?

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328

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KUMAR PRAKASHAN-PERMUTATIONS AND COMBINATIONS-PRACTICE WORK

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Prove that , ""^nPr = ""^((n-1))Pr + r. ""^(n-1)P((r-1))
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If ""nPr=840 and ""^nCr=35, then r is equal to....
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