$(50)^{2} - (49)^{2}$ equals

$(50)^{2} - (49)^{2}$ equals
  1. $99$
  2. $1$
  3. $49$
  4. $100$

Solution

Use $a^{2} - b^{2} = (a+b)(a-b) = 99 \cdot 1 = 99$.

Asked in: IMO

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