hard · GMAT Quant
A 3-slot tag (t_1, t_2, t_3) is generated using symbols from A, B, C, D, E, F. The tag requires t_1 ≠ A, t_i ≠ t_i-1 for i in 2, 3, and t_3 ≠ A.
How many valid tags can be formed?
- 105
- 125
- 100
- 45
- 120
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