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ExamsIBPS POQuantitative Aptitude

What is \(1397 \times 1397\)?

  1. 1951609
  2. 1981709
  3. 18362619
  4. 2031719

Correct answer: 1951609

Solution

Write \(1397 = 1400 - 3\). Then \((1400-3)^2 = 1400^2 - 2\cdot1400\cdot3 + 3^2 = 1960000 - 8400 + 9 = 1951609\).

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