Find (a + b)4 using the Binomial Theorem.  a = a4 + 4a2b + 6a2b2 + 4a1b2 + b4  b = a4 + 4a3b + 6a1b2 + 4a1b3 + b4  c = a5 + 4a3b + 6a2b2 + 4a1b3 + b4  d = a4 + 4a3b + 6a2b2 + 4a1b3 + b4

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