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Question
State the following sets are finite or infinite:
A = {x : x ∈ Z and x < 10}
Solution
A = {x : x ∈ Z and x < 10}
= {....., -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
= {9, 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -4, .....}
∴ It is an infinite set.
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