Two marbles are drawn in succession from a box containing 10 red, 30 white, 20 blue and 15 orange marbles, with replacement being made after each drawing. Then the probability, that first drawn marble

Question

Two marbles are drawn in succession from a box containing 10 red, 30 white, 20 blue and 15 orange marbles, with replacement being made after each drawing. Then the probability, that first drawn marble is red and second drawn marble is white, is

Canvas Classes · Accepted Answer

🧠 With Replacement — The Two Draws Are Independent

Read the question carefully. The key phrase is "with replacement being made after each drawing". This means after the first marble is drawn, it is put back in the box before the second draw.

So the two draws are independent of each other. The probability of the second draw does not depend on what happened in the first draw. This is the most important word in any probability problem on drawing items — always look for "with replacement" or "wit

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