if `(x+y)/(x+y+z)=(y+z)/(x+y+z)=(x+z)/(x+y+z)=p`, then which of the following can be the value of p?

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if `(x+y)/(x+y+z)=(y+z)/(x+y+z)=(x+z)/(x+y+z)=p`, then which of the following can be the value of p? A. `(1)/(2)` B. `2` C. `(2)/(3)` D. 3

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