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  9. Q85

RRB NTPC 2021 · Question 85 of 131

Which of the following options gives the value of 1999² – 999²?

  1. A3000000
  2. B2988000
  3. C2998000Correct
  4. D1000000

Answer: C. 2998000

Explanation

1999² – 999² (1999-999) (1999+999) =1000(2998) =2998000.

Source: RRB NTPC 2021 CBT 1 Previous Year Paper (3 Feb) — ixambee compilation with answer key · reliable-secondary

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