Number of six digit numbers which have 3 digits even & 3 digits odd, if each digit is to be used atmost once is

The number of n digit numbers which consists of the digit 1 and 2 only if each digit is to be used atleast once is equal to 510, then n is equal to ________.

The number of n digit numbers which consists of the digit 1 and 2 only if each digit is to be used atleast once is equal to 510, then n is equal to ________.

The number of n digit numbers which consists of the digit 1 and 2 only if each digit is to be used at least once is equal to 510, then n is equal to ________.

The number of six-digit numbers which have sum of their digits as an odd integer, is

The number of six digit number all digit of which are odd, is ……

The six digit numbers that can be formed using digits 1,3,5,7,9 such that each digit is used at least once.

How many five digits numbers divisible by 3 can be formed using the digits 0,1,2,3,4,7 and 8 if each digit is to be used atmost.once.

Let ' m ' denotes the number of four digit numbers such that the left most digit is odd, the second digit is even and all four digits are different and ' n ' denotes the number of four digit numbers such that left most digit is even, second digit is odd and all four digit are different. If m=nk, then k equals :

Let ' m ' denotes the number of four digit numbers such that the left most digit is odd, the second digit is even and all four digits are different and ' n ' denotes the number of four digit numbers such that left most digit is even, second digit is odd and all four digit are different. If m=nk, then k equals :

Total number of 6 digited numbers in which all the odd digits and only odd digits appear is