Question

If R = {(a, b) lb = a - 1, a ∈ Z, 5 < a < 9, then the range of R is ______.

Options

• {7, 8, 9}

• {5, 6, 7}

• {5, 6, 7, 8, 9}

• {6, 7, 8}

Answer 1

If R = {(a, b)/b = a - 1, a ∈ Z, 5 < a < 9, then the range of R is {5, 6, 7}.

Explanation:

We have,

R = {(a, b) : b = a - 1, a ∈ Z, 5 < a < 9}

∴ R = {(6, 5),(7, 6),(8, 7)}

∴ Range of R = {5, 6, 7}