Manoj and Shira were asked to find an explicit formula for the sequence $-9\,,-27\,,-81\,,-243,...$.
Manoj said the formula is $h(n)=-9\cdot3^{\large{n}}$, and
Shira said the formula is $h(n)=-3\cdot3^{\large{n}}$.
**Which one of them is right?**
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