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Q from permutation and combination
Kphfudtistzhlhlcjajfzhlxhldoystodhcyldtisyodyodupfupfksitstiddupdsuofpysti

Rahul Singh , 7 Years ago
Grade
anser 1 Answers
Arun

Last Activity: 7 Years ago

Dear student
Let a number is such that
* . * . * .
Now even digits (0, 2, 4) occupy odd places
Hence 
3! 
Now odd digits at even places
3! 
Hence total numbers = 3! * 3! = 36 
But there are two casss in which 0 is at first place.
Hence 6 divit number = 36 - 2 *3! = 36 - 12 = 24
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