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Railways PYQCBT 1 2016

RRB NTPC · Question 51

Calculate: \((40.7×40.7×40.7+1)/(40.7×40.7-40.7+1)\) A. 417 B. 4.17 C. 41.7 D. 441.7

  1. C

  2. D

  3. B

  4. A

Show answer & explanation

Answer: (A) C

Explanation

With a = 40.7: (a³ + 1)/(a² − a + 1) = (a + 1)(a² − a + 1)/(a² − a + 1) = a + 1 = 41.7.