what is the units digit of the expression 7^75+6?	Select the correct option
A) 1 B) 3 C) 5 D) 7 E) 9

Rationale: "7 in power repeats pattern of 4 : 7 - 9 - 3 - 1 . as 75 = 4 * 18 + 3 then the last digit of 7 ^ 75 is the same as the last digit of 7 ^ 3 , which is 3 . units digit of 7 ^ 75 + 6 will be : 3 + 6 = 9 . answer is e"
Answer: E