Let X be a convex region in the plane bounded by straight lines. Let X – McqOptions

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1.	Let X be a convex region in the plane bounded by straight lines. Let X have 7 vertices. Suppose f(x,y) = ax + by + c has maximum value M and minimum value N on X and N < M. Let S = {P ∶ P is a vertex of X and N < f(P) < M}. If S has n elements, then which of the following statements is TRUE?
A.	n cannot be 5
B.	n can be 2
C.	n cannot be 3
D.	n can be 4
Answer» E.

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