Question

what is the unit digit of 9^9^99

Answer 1

Answer:

9

Step-by-step explanation:

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Answer 2

Answer:

6, 4^3 = ... 4, and so on. So the unit digit of 4^n with n is an even number (44) is 6 (and if n is odd, the unit digit is 4). Therefore, the unit digit of 9^99 - 4^44 = 9 - 6 = 3.