By Mansi Yadav

Verified by Ajay Kumar

Find the unit digit of 999^3 + 888^2 + 777^1.

  1. 4

  2. 6

  3. 2

  4. 0

Answer: D

Solution

Solution: The unit digit of 999^3 is the unit digit of 9^3, which is 9. The unit digit of 888^2 is the unit digit of 8^2, which is 4. The unit digit of 777^1 is 7. Adding the unit digits gives \(9+4+7=20\), whose unit digit is 0. Trick: For addition, calculate only the unit digits of the individual terms.

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