19 ^ { 2 } - 18 ^ { 2 } = \dots – InterviewSolution

1.	19 ^ { 2 } - 18 ^ { 2 } = \dots
Answer» use a² - b² = (a-b) (a+b)19² - 18² = (19-18)(19+18) = 1 × 37 = 37

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