64
2
You can make 4*3*2/2 = 12 numbers.
162
2 Nope! definitely not 2.. The answer should be 126 I'm looking for the solution. Eg. Q. How many 4 digit numbers can be made from the digits 1-9 A. 9X8X7X6= 3024.
-2
321 312 213 231 123 132 6 3 digit numbers.
Allowing numbers that start with zero, the answer is 6!/(2!*2!) = 720/(2*2) = 180
-- If the same digit may be repeated, then 64 can be made. -- If the same digit may not be repeated, then 24 can be made.
59
6! = 720
If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.
120 5-digit numbers can be made with the numbers 12345.