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Railways PYQCBT 1 2016

RRB NTPC · Question 28

Find the unit digit in (1234)^102 + (1234)^103 A. 2 B. 4 C. 0 D. 1

  1. B

  2. C

  3. A

  4. D

Show answer & explanation

Answer: (B) C

Explanation

Powers of a number ending in 4 end in 6 for even powers and 4 for odd powers. 1234¹⁰² ends in 6 and 1234¹⁰³ ends in 4, so the sum ends in 0.