Binomial

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Across
  1. 4. 7x^6y
  2. 7. useful application of Pascal's triangle
  3. 8. 84a^5b^2.
  4. 9. the triangle is also _____________.
Down
  1. 1. (n+1) in (x+y)^n.
  2. 2. coefficient for Binomial expansion.
  3. 3. 21 in x^5.
  4. 5. 1 is at the top in triangular pattern.
  5. 6. top row in Pascal's triangle.