Sticker machine without replacement
Sticker machine without replacement
Secondary 2
3 marks
TGM Original Questions
Core stretch
The machine selects each remaining sticker with equal probability.
A machine contains \(4x\) train stickers and \(3x\) ship stickers.
- Find the probability that the first sticker is a ship.[2]
- The first sticker dispensed is a ship. The probability that the second is a train is \(\frac{8}{13}\). Find the initial number of train stickers.[1]
Solution:
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Answer:(a) \(\frac{3}{7}\) (b) \(8\) train stickers.
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