A three digit number n is such that the last two digits of it are equal and different from the first. The number of such n's is

A three digit number n is such that the last two digits of it are equal and different from the first.The number of such n' is

The number of three digit numbers such that its first two digits are each divisible by its third digit is

The hundred digit of a three digit number is 7 more than the unit digit. The digits of the number are reversed and the resulting number is subtracted from the original three digit number. The unit digit of the final number, so obtained is

The number of 'n' digit numbers such that no two consecutive digits are same is

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 :