2017 · Q118
Consider the following number:
n = [(6374)^1793 x (625)^317 x (313)^49]
Which one of the following is the digit at the unit place of n?
general-mental-abilitynumber-alphabet-series
- A0
- B1
- C2
- D5
Explanation
Unit digits: 6374^1793 ends in 4 (an odd power of a number ending in 4); 625^317 ends in 5; 313^49 ends in 3 (since 49 mod 4 = 1). Their product ends in 4 × 5 × 3 = 60, i.e. 0. Hence (A).