Question

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

A. F₂ ⋂ F₃

B. F₃ ⋂ F₄

C. F₂ ⋃ F₃

D. F₂ ⋃ F₃ ⋃ F₄ ⋃ F₁

Answer 1

Here, 

F₁ is the set of all parallelograms

We know that every rectangle, rhombus and square in plane are parallelogram but trapezium is not parallelogram 

So,

F₁⋃F₂⋃F₃⋃F₄.