State which of the following sets are finite, which are infinite : 

(i) A = {x : x  N,  and (x-1) (x - 2) = 0}

(ii)  { x : x  N and x² = 25}

(iii)  { x: x N, 2x-1  = 0}

(iv)  { x : x  N, x is prime}

Make correct statement by filling in the symbols ⊂ or ⊄ in the blank spaces :

(i) {2, 3, 4}........{1, 2, 3, 4, 5} 

56. Make correct statement by filling in the symbols ⊂ or ⊄ in the blank spaces :

(iv)  {x: x is a circle in the plane}.... {x:x is a circle in the same plane with radius 1 unit}