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Q.

Let F1 be the set of parallelograms, F2 the set of rectangles, F3 be the set of rhombuses, F4 be the set of squares and F5 be the set of trapeziums in a plane. Then F1 may be equal to 

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a

F2∩F3

b

F3∩F4

c

F2∪F5

d

F2∪F3∪F4∪F1

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Every rectangle, rhombus, square in a plane is a parallelogram

but every trapezium in not a parallelogram 

∴ F1=F2∪F3∪F4∪F1

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