medium · GMAT Quant
A warehouse marks inventory bins with a 3-letter code b_1 b_2 b_3 selected from A, B, C, D, E, F (2 vowels A, E and 4 consonants). Bins require b_1 and b_3 to be vowels, with adjacent letters being distinct (b_2 ≠ b_1 and b_3 ≠ b_2).
How many different bin codes are possible?
- 16
- 18
- 20
- 24
- 50
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