hard · GMAT Quant
An automated security controller generates 5-character access codes using three symbols: A, B, and C. Due to signal interference rules, symbol A cannot appear in two consecutive positions, and symbol B cannot appear in two consecutive positions. Symbol C has no placement restrictions.
How many distinct valid 5-character access codes can be formed?
- 81
- 99
- 121
- 141
- 243
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