StudyPhysco

  Exercise 1.3  1. Make correct statements by filling in the symbols ⊂ or ⊄ in the blank spaces: (I) {2, 3, 4} … {1, 2, 3, 4, 5} (ii) { a , b , c } … { b , c , d } (iii) { x : x is a student of Class XI of your school} … { x : x student at your school} (iv) { x : x is a circle in the plane} … { x : x is a circle in the same plane with radius 1 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} Solution: (i) {2, 3, 4} ⊂ {1, 2, 3, 4, 5} (ii) { a , b , c } ⊄ { b , c , d } (iii) { x : x is a student of Class XI of your school} ⊂ { x : x student at your school} (iv) { x : x is a circle in the plane} ⊄ { x : x is a circle in the same plane with radius 1 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...