`A {x in R |x^(2) +3=0}` is a set of………type.

B= {x in N |x ge 7} is a set of……type.

A = { x in N| x^(3) =x } is singleton set.

{x//(1)/(|3x+2|)le1/5, x in R - (-2//3)} then what is the complement set of this set ?

Which of the following sets are empty sets ? {x : x^(2) -2=0, x " is a rational number "}

Prove that the relation R defined on the set N of natural numbers by xRy iff 2x^(2) - 3xy + y^(2) = 0 is not symmetric but it is reflexive.

Are the following pari of sets equal? Give reasons A= {x : x in Z, x^(2) le 8} B= {y : y in R, y " is a solution of "y^(2)-4y+3=0}

Write the solution set of the equation x^(2)+x -2=0 in roster form.

Match each of the set on the left described in the roster form with the same set on the right described in the set-builder form : (i) {P, R, I, N, C, A, L} (a) { x : x is a positive integer and is a divisor of 18} (ii) { 0 } (b) { x : x is an integer and x^(2) – 9 = 0 } (iii) {1, 2, 3, 6, 9, 18} (c) {x : x is an integer and x + 1= 1 } (iv) {3, –3} (d) {x : x is a letter of the word PRINCIPAL}

The representation of the set {x inN|x^(2)+9=0} is phi .

Match roster forms with the set builder form. (i) {p,r,I,n,c,a,l} (a) {x : x is a positive integer and is a divisor of 18} (ii) {0} (b) {x : x is an integer and x^(2)-9=0} (iii) {1,2,3,6,9,18} (c) {x : x is an integer and x+1=1} (iv) {3,-3} (d) {x : x is a letter of the word PRINCIPAL}