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Homework Statement
It says: Determine the coefficient of p4q7 in the expansion of (2p-q)(p+q)10.
I can find the coefficient of p4q6 in the expansion of (p+q)10 but how am I to find it for (2p-q)(p+q)10?
Homework Equations
Binomial expansion formula.
The Attempt at a Solution
[Coefficient of p4q6 in the expansion of (p+q)10 = (10C6) x (p)4 x (q)6.]