Write out the equation as a sum

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Reference no: EM1319867

Question: Consider the expression (x+y)4

[A] Write out the equation as a sum;
[B] Express the sum using the summation notation with coefficients expressed in combination form;
[C] Let x = y = 1 and use (b) to find an equation for 24;
[D] Find an interesting expression for 2n.

Reference no: EM1319867

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