Question

Find the cardinal number of the following set:
{no. of symmetrical lines in a circle}​

Answer 1

Answer:

(i) A = {0,1, 2, 4} i.e n(A) = 4

(ii) B = {-3, -1, 1, 3, 5, 7} i.e n(B) = 6

(iii) C = {} i.e n(C) = 0

(iv) D = {3, 2, 2, 1, 3, 1, 2} = D = {3, 2, 1} i.e n(D) = 3

(v) E = {16, 17, 18, 19} i.e n(E) = 4

(vi) F = {8, 9 , 10, 11, 12, 13, 14} i.e n(F) = 7