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Sticky Note
The value of (31)² - (29)² = _____?
  1. 100
  2. 120
  3. 110
  4. None of these
Explanation

Using the identity a² - b² = (a+b)(a-b):

(31)² - (29)² = (31+29)(31-29)

= (60)(2)

= 120

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