Homework Help: Math

Posted by Carol on Sunday, October 21, 2012 at 12:16pm.

How many five digit numbers can be formed from the set of nine numbers (0,1,2,3,4,5,6,7,8) if no number is repeated and no number starts with zero and
a) there are no other restrictins
b) the result must be an odd number

Math - Reiny, Sunday, October 21, 2012 at 12:41pm
a) no restrictions, except can't start with a zero
so 8x8x7x6x5 = 13440

b) has to be odd, not start with zero
has to end with odd number, there are 4 of these
can't start with zero, leaving 7 (remember one is already gone in the odd spot)

number of cases = 7x7x6x5x4 = 5880
Math - Carol, Sunday, October 21, 2012 at 12:51pm
thank you!

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