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Quantitative Aptitude

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What is the s...

Question

What is the sum of all 5 digit nos that are formed by using 1,3, 5, 7, 9 taken one at a time?

A

5555500

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B

66600

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C

6666600

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D

666600

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Solution

The correct option is C
6666600

The sum is given by (n-1)! $\times$ (sum of all the digits) $\times$ (1111...n times)

Here n=5

Sum = 4! (25)(11111) = 6666600 option (c)

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