The security gate at a storage facility requires a five-digit lock code. If the lock code must consist only of digits from 1 through 7, inclusive, with no repeated digits, and the first and last digits of the code must be even, how many lock codes are possible?
Choose one:
A) 120	B) 240	C) 360	D) 720	E) 1440
X-X-X-X-X --&gt; there are 3 even digits from 1 to 7, inclusive thus options for the first and the last X's are: 3-X-X-X-2. Other X's can take following values: 3-5-4-3-2 --&gt; 3*5*4*3*2=360.   Answer: 360.
<result>C</result>
The security gate at a storage facility requires a five-digit lock code. If the lock code must consist only of digits from 1 through 7, inclusive, with no repeated digits, and the first and last digits of the code must be even, how many lock codes are possible?