Mathematics · Permutations and Combinations
A new flag is to be designed with six vertical stripes using some or all of the colours yellow, green, blue, and red. The number of ways this can be done such that no two adjacent stripes have the same colour is:
- 112 × 81✓
- 220 × 125
- 316 × 192
- 424 × 216
Correct answer
12 × 81
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