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If \(z\) is a positive two-digit even number, what is the ones digit of \(z?\)
1) Both digits of \(z\) are the same.
2) The ones digit of \(z\) is the same as the ones digit of \(z^2.\)
Answer: C
Source: Economist
1) Both digits of \(z\) are the same.
2) The ones digit of \(z\) is the same as the ones digit of \(z^2.\)
Answer: C
Source: Economist
