How many numbers containing the digits 2 AND 3 are in the interval [0,100]?
1 answer:
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The 4-member family can be seated in 4! ways.
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Diagrammatically, the result is shown in the figure below. The two brothers are family members 3 and 4, shown in shaded color.
Answer: 12 ways.
The two brothers can be seated together in 2! ways.
Therefore, the total number of ways is
Diagrammatically, the result is shown in the figure below. The two brothers are family members 3 and 4, shown in shaded color.
Answer: 12 ways.