Question
The number of three-digit odd numbers with no repeated digits is
a) 288, b) 320, c)336, d) 360, e) 405.
a) 288, b) 320, c)336, d) 360, e) 405.
Answers
Reiny
5 digits possible in the unit digit position
leaving 8 digits for the lead digit, since it can't be a zero and one digit is gone
leaving 8 digits for the tens position, could have the zero here
Number of cases = 5*8*8 = 320
leaving 8 digits for the lead digit, since it can't be a zero and one digit is gone
leaving 8 digits for the tens position, could have the zero here
Number of cases = 5*8*8 = 320