pascals triangle 3

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Across
  1. 3. The triangle represents this kind of expansion.
  2. 4. The total of a row equals this number to some power.
  3. 5. The triangle looks identical on both sides.
Down
  1. 1. The numbers multiplying terms in a binomial.
  2. 2. The mathematician who discovered it.
  3. 4. The geometric shape of the pattern.