Question

Find the cardinal number of the following set.

R = {x : x is an integer, x ∈ Z and – 5 ≤ x < 5}

Answer 1

x ∈ z

R = {– 5, – 4, – 3, – 2, – 1, 0, 1, 2, 3, 4}

∴ n(R) = 10