Let `F_(1)` be the set of parallelograms, `F_(2)` the set of rectangle , `F_(3)` the set of
Channel: Doubtnut
Date: 19/01/2020

Let `F_(1)` be the set of parallelograms, `F_(2)` the set of rectangle , `F_(3)` the set of rhombuses, `F_(4)` the set of squares and `F_(5)` the set of trapeziums in a plane. Then, `F_(1)` may be equal to