- A60
- B220
- C12
- D64
Step-by-Step Solution
One pen must come from each colour group: 3 = 60 ways. The value counts every selection of 3 pens regardless of colour.
Answer: A) 60
A box holds 5 red pens, 4 blue pens and 3 green pens, all distinguishable. In how many ways can 3 pens be selected so that all three are of different colours?
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