ANSWERS: 1
  • Well, the total number of balls in the bag is 4 + n, where there are 4 yellow balls and n red balls. If a red ball is drawn first, there is an n/(n+4) chance that this will occur. Following that, there will be a 4/(n+3) chance of drawing a yellow ball as the total number of balls in the bag are reduced by one and there are 4 yellow ones. To get the overall probability, multiply the two together and simplify the expression. The overall probability will work out the same if a yellow ball is drawn first.

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