By Mansi Yadav

Verified by Ajay Kumar

What is the unit digit of 17⁸³?

  1. 1

  2. 2

  3. 3

  4. 4

Answer: C

Solution

Solution: The unit digit of powers of 7 repeats in the cycle 7, 9, 3, 1. Since \(83=4\times20+3\), the remainder on dividing 83 by 4 is 3. The third digit in the cycle is 3. Therefore, the unit digit of \(17^{83}\) is 3. Trick: For powers ending in 7, divide the exponent by 4 and use the remainder to select the digit in the cycle.

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