math
posted by Gabe .
The numbers 1, 7, 21, 35, 35, 21, 7, 1 form a row of pascal's Triangle.
Which power of (a+b) does the row go with?
Write the next row?

easy ....
since (a+b)^n = 1a^2 + na^(n1) b + ....
so 1, 7, 35 ... must come from (a+b)^7
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