hard · GMAT Quant
A data transmission packet header consists of 5 ternary slots (b_1, b_2, b_3, b_4, b_5) using digits from 0, 1, 2. The sequence requires b_1 ≠ 0, no adjacent identical digits (b_i ≠ b_i-1), and b_5 = 0.
How many distinct valid headers can be transmitted?
- 10
- 16
- 12
- 8
- 24
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