medium · GMAT Quant
A telecom signal repeater transmits data pulses on Channel X, Channel Y, or Channel Z over 5 time steps. Operating protocols mandate that Channel X cannot immediately follow Channel X, and Channel Y cannot immediately follow Channel Y. If any channel can be used at time step 1
How many total valid 5-step transmission sequences exist?
- 41
- 99
- 164
- 239
- 243
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