View source for Q-number when a=n is a natural number

==Theorem==
The following formula holds for $n \in \{1,2,\ldots\}$ and $q \in \mathbb{C} \setminus \{0,1\}$:
$$[n]_q=\displaystyle\sum_{k=1}^n q^{k-1},$$ 
where $[n]_q$ denotes a [[q-number|$q$-number]].

==Proof==

==References==
* {{BookReference|A Comprehensive Treatment of q-Calculus|2012|Thomas Ernst|prev=q-number|next=q-factorial}}: ($6.2$)

[[Category:Theorem]]
[[Category:Unproven]]