To find out how many milliliters are in 3 pints, we first need to convert pints to quarts, and then convert quarts to milliliters.
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Convert pints to quarts: Since 1 quart = 2 pints, we can find out how many quarts are in 3 pints: \[ 3 \text{ pints} \times \left(\frac{1 \text{ quart}}{2 \text{ pints}}\right) = 1.5 \text{ quarts} \]
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Convert quarts to milliliters: Now, using the conversion that 1 quart = 946.35 milliliters: \[ 1.5 \text{ quarts} \times 946.35 \text{ mL/quart} = 1419.525 \text{ mL} \]
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Round to the nearest tenth: \[ 1419.525 \text{ mL} \approx 1419.5 \text{ mL} \]
Therefore, the answer is 1419.5 mL.