Question:medium
A small store has five units of a new phone model in stock: two white, two black, and one red. Three customers arrive at the shop to buy a unit each. Each one has a pre-determined choice of the colour and will not buy a unit of any other colour. All the three customers are equally likely to have chosen any of the three colours. What is the probability that the store will be able to satisfy all the three customers?
A small store has five units of a new phone model in stock: two white, two black, and one red. Three customers arrive at the shop to buy a unit each. Each one has a pre-determined choice of the colour and will not buy a unit of any other colour. All the three customers are equally likely to have chosen any of the three colours. What is the probability that the store will be able to satisfy all the three customers?
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When counting favorable outcomes for stock satisfaction, list all possible demand tuples that do not exceed stock, then count the number of permutations for each tuple.
Updated On: Mar 30, 2026
- 1/5
- 2/3
- 2/5
- 7/9
- 1/3
Show Solution
The Correct Option is B
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