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Question
Write the relation R = {(x, x3): x is a prime number less than 10} in roster form.
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Solution
R = {(x, x3): x is a prime number less than 10}
= {(x, x3) : X ∈ {2, 3, 5, 7})
= {(2, 23), (3, 33), (5, 53), (7, 73)}
∴ R = {(2, 8), (3, 27), (5, 125), (7, 343)}
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