What is the tens digit of 7^1001? Select the correct option.
A) 0 B) 0 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 .   1001= 4*250 + 1   The ten's digit will be 1 .   Answer 0
<result>B</result>
What is the tens digit of 7^1001?