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How many 3-digit even numbers that can b...

How many 3-digit even numbers that can be formed using the digit 2,4,6,8 ?

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The correct Answer is:
64, 24
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KUMAR PRAKASHAN-PERMUTATIONS AND COMBINATIONS-PRACTICE WORK
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  5. Prove that , ""^nPr = ""^((n-1))Pr + r. ""^(n-1)P((r-1))

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  7. If ""^((n+2)) C8 :"" ^((n-2)) P4= 57 : 16 then find n.

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  8. If ""^nC10= ""^nC12 then find ""^23Cn.

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