SOLUTION: What is the coefficient of a^3 z^3 in the expansion of (a+z)^12 : please i need help on these question can any one help me???? please help...

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Question 195625: What is the coefficient of a^3 z^3 in the expansion of (a+z)^12 : please i need help on these question can any one help me????
please help...
Answer by edjones(7311) About Me  (Show Source):
You can put this solution on YOUR website!
There can't be an a^3z^3 in this expansion.