What is the tens digit of 7^1415? Choose the correct option.
A) 0  B) 1  C) 2  D) 3  E) 4
7^1 = 7   7^2 = 49   7^3 = 343   7^4 = 2401   7^5 = 16807   7^6 = 117649   We should see this as pattern recognition . We have a cycle of 4 . (We can multiply the last 2 digits only as we care about ten's digit )   0 , 4 , 4 , 0 .   1415= 4*353 + 3   The ten's digit will be 4 .   Answer 4
<result>E</result>
What is the tens digit of 7^1415?