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23 October, 11:13

What is the coefficient of the term x7y in the expansion of (x + y) ^8?

a1

b8

c28

d56,

+3
Answers (1)
  1. 23 October, 13:10
    0
    The coefficient for x^7*y is equal to 8Choose7 which is 8!/7! which is 8, or answer b. Pascal's triangle may be used to capture this as well, or use the exponent as above.
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