How many three-digit numbers are there, if the two leftmost digits are even, the other digits are odd and the digit 4 cannot appear more than once in the number.  Choose one: A) 85 B) 90 C) 95 D) 100 E) 105
N=(4*5-1)*5*=85   where   4 cases of first digit {2,4,6,8}   5 cases of second digit {0,2,4,6,8}   1 case of 44 for two leftmost digit   5 cases of third digit {1,3,5,7,9}   85
<result>A</result>
How many three-digit numbers are there, if the two leftmost digits are even, the other digits are odd and the digit 4 cannot appear more than once in the number.