Question

Find the unit digit of ${64}^{102}+{64}^{103}$

• A. 4
• B. 6
• C. 10
• D. 0

Answer 1

The correct option is D 0

From the concept of cyclicity: 4 to the power odd number will result in the unit digit ‘4’ and 4 to the power even number will result in the unit digit ‘6’. Hence the answer is 4+6= 10. The unit digit of 10 is 0.