Mark M. answered 04/25/15
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(A + B)n = nC0AnB0 + nC1An-1B1 +... + nCnA0Bn
For (2u + p)12, the 9th term is 12C8(2u)4p8 = 495(16u4)p8
= 7920u4p8
The coefficient is 7920.