- A60
- B80
- C125
- D100
Step-by-Step Solution
Left stripe: 5 colours. Middle: anything but the left one, 4. Right: anything but the middle one, 4. . (60 forbids the outer stripes from matching.)
Answer: B) 80
Three side-by-side stripes of a flag are to be coloured using 5 colours. Neighbouring stripes must differ, but the two outer stripes may match. How many colourings are possible?
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