\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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Which of the following is the correct first sentence for a direct proof of the statement "For all real numbers \(x\), \(x^2 \ge 0\)"?
"Let \(x^2 \ge 0\)."
"Assume \(x\) is a positive number."
"Let \(x\) be a real number."
"For some real number \(x\)."
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