Units digit of 7^5^6^13? Choose the correct choice from the following answers:
A) 7	B) 8	C) 9	D) 1	E) 11
(7^5) unit digit is 7   7^6 unit digit is 9   9^13 unit digit 9   hence unit digit is 9.   ANSWER:8
<result>B</result>
Units digit of 7^5^6^13?