hard · GMAT Quant
In an inventory pipeline, the duration of the k-th job is d_k = dfrack(k+1)! for integers 1 ≤ k ≤ 10.
What is the sum of the durations of the first 10 jobs?
- dfrac10! - 110!
- dfrac11! - 111!
- dfrac111!
- dfrac11!11! + 1
- 1 - dfrac19!
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