NCERT Example 6 - Sets
Question: State whether each set is finite or infinite: (i) {x in N : (x - 1)(x - 2) = 0}; (ii) {x in N : x^2 = 4}; (iii) {x in N : 2x - 1 = 0}; (iv) prime numbers; (v) odd natural numbers.
Answer: (i), (ii), and (iii) are finite; (iv) and (v) are infinite.
Full step-by-step NCERT solution with diagrams on Something by Zero.