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Sticky Note
Find the value of 100² − 99²?
  1. 1
  2. 199
  3. 100
  4. 198
Explanation

We are given the expression:

100² − 99²

This is a difference of squares:

a² − b² = (a − b)(a + b)

So:

100² − 99² = (100 − 99)(100 + 99) = 1 × 199 = 199


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