Brent@GMATPrepNow wrote:
Is CB || ED?
(1) ∆ABC and ∆AED are both isosceles triangles
(2) ∠C = ∠E
Statements combined:
Case 1:
In this case, ∠B = ∠E and ∠C = ∠D, so CB || ED.
Case 2:
In this case, ∠B ≠∠E and ∠C ≠∠D, so CB
∦ ED.
Since the answer to the question stem is YES in Case 1 but NO in Case 2, INSUFFICIENT.
The correct answer is
E.
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