It is B, the coefficient of the x-term. When you multiply this out, you get x*x+x*q+x*p+p*q, or x^2+x(p+q)+p*q
Notice how the x term is multiplied by p+q.
Hope this helps!
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What was your last question, I might be able to help.
The answer would be 36 because theres 6 people and 6 seats so 6*6 = 36
