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Old 05-13-2008   #79
theredsky
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(x+y)^6
Using Pascal's triangle, we could figure out the problem

x^6 + 6*x^5*y + 15*x^4*y*2 + 20*x^3*y*3 + 15*x^2*y^4 + 6*x*y^5 + y^6

Do you notice a pattern?