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if p+q is 4 times p-pq, and pq is not equal to zero, which of the following have exactly ONE value?

a. p
b. q
c.pq
d. p+pq

Answer :

ALin03
We can set up an equation using the information the problem provides us: 
p + pq = 4(p - pq) 
p + pq = 4p - 4pq 
5pq = 3p 
...since pq ≠ 0... 
5q = 3 
q has to = 3/5 is required. Therefore, b

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