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No. of 6-digit nos. which have 3 digits even and 3-digits odd, if each digit is to be used at most once is?
Dear Jee king
number of ways of selection of 3 even number from 0,2,4,6,8 is 5C3
number of ways of selection of 3 odd number from 1,3,5,7,9 is 5C3
Total ways =5C35C3 6!
but this number also include zero at first place
total number in which zero at place place = 5C34C2 5!
so total number =5C35C3 6! -5C34C2 5!
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