15. A security code used to consist of two odd digits, followed by four even digits. To allow more codes to
be generated, a new system uses two even digits,
followed by any three digits. If repeated digits are
allowed, the increase in the number of possible codes
is ? Note: zero is considered an even number.
A) 6,393,600
B) 9,375
C) 3,125
D) 15,625
What is the answer?