The units digit of (35)^(87) + (93)^(49) is:	Choose one:
A) 2 B) 4 C) 6 D) 8 E) 0

Rationale: "the units digit of powers of 3 , cycles in a group of 4 : { 3 , 9 , 7 , 1 } 49 has the form 4 k + 1 , so the units digit of 93 ^ 49 is 3 . the units digit of powers of 5 is always 5 . 3 + 5 = 8 , so the units digit is 8 . the answer is d ."
Answer: D