What is the unit digit of 8^25?

Number System (Unit Digit) · Quantitative Aptitude · Medium · Practice for SSC CGL Tier 1

What is the unit digit of 8^25?

  1. 8
  2. 7
  3. 2
  4. 0
Answer and solution

Correct answer: A) 8

Unit digits of powers of 8 repeat every 4: 8, 4, 2, 6. 25 ÷ 4 leaves remainder 1, so take place 1 of the cycle: 8.

Learn the method: Number System (Unit Digit) rules and worked examples · SSC CGL Tier 1 Quantitative Aptitude

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