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2/3 × 3/4: subdivide unit square · count shaded cells · multiply tops, multiply bottoms · runs locally

p (of p/q)2q3r (of r/s)3s4
2/3 × 3/4 = (2×3)/(3×4) = 6/12 = 1/2 · 2×3=6 shaded cells out of 3×4=12 total cells in the unit square
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