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Q.

The number of 8 digit numbers that can be formed using all the digits of the numbers 1,2,3,4,1,2,3,4 so that even digits occupy only even places is_________

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answer is 36.

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Detailed Solution

 _  E_   _   E_   _   E_   _  E_ =4!2!2!×4!2! 2!=36

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The number of 8 digit numbers that can be formed using all the digits of the numbers 1,2,3,4,1,2,3,4 so that even digits occupy only even places is_________