Question

If R = {(x, y) | x, y ∈ Z, x² + y² ≤ 4} is a relation in Z, then domain of R is
(a) {0, 1, 2}
(b) {0, −1, −2}
(c) {−2, −1, 0, 1, 2}
(d) none of these

Answer 1

(c) {−2, −1, 0, 1, 2}

Domain of R includes all values of x satisfying the relation.