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Railways PYQCBT 1 2020

RRB NTPC · Question 73

For any natural number n, 6^n - 5^n always ends with

  1. 7

  2. 5

  3. 3

  4. 1

Show answer & explanation

Answer: (D) 1

Explanation

Every power of 6 ends in 6 and every power of 5 ends in 5, so 6ⁿ − 5ⁿ always ends in 1.