can be the set of rational numbers or, for that matter, the set R of real numbers. For another example, in human population studies, the universal set consists of all the people in the world. EXERCISE . .
Make correct statements by filling in the symbols ⊂ or ⊄ in the blank spaces : { , , } . . . { , , , , } (ii) { a , b , c } .
. . { b , c , d } (iii) { x : x is a student of Class XI of your school}. .
.{ x : x student of your school} (iv) { x : x is a circle in the plane} . . .{ x : x is a circle in the same plane with radius unit} (v) { x : x is a triangle in a plane} . .
. { x : x is a rectangle in the plane} (vi) { x : x is an equilateral triangle in a plane} . . .
{ x : x is a triangle in the same plane} (vii) { x : x is an even natural number} . . . { x : x is an integer} SETS Fig .
. Examine whether the following statements are true or false: { a , b } ⊄ { b , c, a } { a , e } ⊂ { x : x is a vowel in the English alphabet} (iii) { , , } ⊂ { , , } (iv) { a } ⊂ { a , b, c } (v) { a } ∈ { a , b, c } (vi) { x : x is an even natural number less than } ⊂ { x : x is a natural number which divides } . Let A = { , , { , }, }. Which of the following statements are incorrect and why?