Normally 1 pair
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A trapezoid does not has 2 pairs of parallel lines. A parallelogram does.
A rectangle has 2 pairs parallel lines and a trapezoid can only have 1 pair of parallel lines.
A trapezoid has only one pair of parallel lines so it cannot be a parallelogram which must have two pairs of parallel lines.
1 set; _____ /_____\
Just one. And the other pair cannot be parallel.