April 29, 2011 4:11pm UTC
There are 5 choices for the first digit, 4 choices for the second, 3 choices for the third, ...
The choices are independent of each other, so we multiply the number of choices to get the count of different numbers:
5*4*3*2*1 = ?
April 29, 2011 5:22pm UTC
The above answer assumes all 5 digits are used, and without repetition.
April 29, 2011 5:23pm UTC
single digit number = 5
double digit number = 5x4 = 20
triple ditit number = 5x4x3 = 60
four digit numbers = 5x4x3x2 = 120
five digit numbers = 5x4x3x2x1 = 120
add them up
April 29, 2011 6:10pm UTC
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