Question

What is the unit digit in 7^{68} – 3^{59} ?

Answer 1

Answer:

From 6^59, we will only get 6 as the units digit. From 7^71, we will get 7^(68 + 3), ie 3rd term of the cycle, ie 3. So effectively the units digit of the expression is the units digit of the number 3*6*3, which is 4. (as the number is 54).

Step-by-step explanation:

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