hard · GMAT Quant
In a server queue, the number of active tasks T_k+1 at time step k+1 is given by T_k+1 = 4 T_k - 15. The server log shows that at time step 4, there are 69 active tasks.
If all task counts must be positive integers, what was the task count at time step 1?
- 6
- 9
- 21
- 24
- 45
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