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`G` is the centroid of triangle `ABC` and `A_1` and `B_1` are the midpoints of sides `AB` and `AC` , respectively. If `Delta_1` is the area of quadrilateral `G A_1A B_1` and `Delta` is the area of triangle `ABC` , then `Delta/Delta_1` is equal to
a.`3/2`
b. `3`
c. `1/3`
d. none of these

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