\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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To ensure that a sample of marbles drawn from a small bag is truly a "random sample" (where trials are independent), which method must be used?
Drawing all marbles at once.
Drawing a marble and setting it aside (without replacement).
Drawing a marble, noting its color, and putting it back (with replacement).
Selecting only the marbles that are on top.
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