pascals triangle 2

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Across
  1. 1. The sum of a row equals this number to some power.
  2. 2. The triangle is named after this French mathematician.
  3. 4. Every row begins and ends with this number.
  4. 5. Each number is made by adding the two above.
Down
  1. 1. The overall shape of the pattern.
  2. 3. The triangle is built line by line, called these.