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A \straight line" between two points on a sphere is dened to be an arc of the great

circle passing through these points. Given two points on the equator on the Earth

(considered as a perfect sphere), one at longitude 0 degree and the other at longitude

180 degrees, the number of \straight lines" passing through these two points is

(A) 1. (B) 2. (C) 4. (D) innite.

1
by Sid999

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