To multiply the mixed number \(3 \frac{1}{2}\) by \(4\), we first convert the mixed number into an improper fraction.
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Convert \(3 \frac{1}{2}\) to an improper fraction: \[ 3 \frac{1}{2} = \frac{3 \times 2 + 1}{2} = \frac{6 + 1}{2} = \frac{7}{2} \]
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Multiply the improper fraction by \(4\): \[ 4 = \frac{4}{1} \]
Now, multiply: \[ \frac{7}{2} \times \frac{4}{1} = \frac{7 \times 4}{2 \times 1} = \frac{28}{2} \]
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Simplify \(\frac{28}{2}\): \[ \frac{28}{2} = 14 \]
Thus, the product of \(3 \frac{1}{2} \times 4\) is \(14\), which can be expressed as a mixed number, although in this case it is simply: \[ \boxed{14} \]