If X and Y are 2 finite sets such that n() = 9, n( XY) - 4 and n( XY) -15, then n() is
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Check the picture below.
for "b", well, recall that the sum of all interior angles in a triangle is 180°.
for "a", "c" and "d", well, all those are just <u>intercepted arcs</u>.
