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Find the number of even positive number ...

Find the number of even positive number which have five digits.

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The correct Answer is:
45000
Even number ends with the digits 0,2,4,6,8
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  13. Evaluate (n!)/(r!(n-r)!), where n=15,r=4

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  14. Evaluate ""^(20)P(3)

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  15. Evaluate ""^(5)P(3)xx""^(7)P(3)

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  16. Find n, if ""^(n)P(5)=42 ""^(n)P(3), n ge 5

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  17. Show that ""^(n)P(n)=2""^(n)P(n-2)

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