solve this easily.
Answer is 1
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unit digit= 3
so 3^84
divide 84 by 4
84/4 = 21 and reminder 0
so replace the power by 4
3^4 = 81 unit digit=1 is answer
so 3^84
divide 84 by 4
84/4 = 21 and reminder 0
so replace the power by 4
3^4 = 81 unit digit=1 is answer
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