hard · GMAT Quant
A message queue processes 5-character security headers using E, F, G. Odd position slots (positions 1, 3, and 5) must be picked from E, F. The rule set specifies that character G cannot directly follow character E, and adjacent identical characters are banned throughout.
How many valid 5-character headers can be created?
- 12
- 16
- 8
- 18
- 6
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