SOLUTION: I need help with this question. What is the third term in the expansion of (x + 2y) power of 17?

Question 715608: I need help with this question. What is the third term in the expansion of (x + 2y) power of 17?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
SInce the power is , the expansion would have terms.
The degree of all the terms (the sum of the powers of and of ) will be .
The first term will have and .
The second term will have and .
Term number would have
as a factor.
As the power is , it would also have
as a factor.
The other factor would be the combinatorial number that tells you how many different groups of 2 you can make with 17 different items:

The third term is

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