why 2n-1 ,why not n+1?

can anyone give more examples on this.

what if, if we want to have "aac".

can anyone give more examples on this.

what if, if we want to have "aac".

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A grammar $G$ is in Chomsky-Normal Form (CNF) if all its productions are of the form $A \to BC$ or $A \to a$, where $A,B$ and $C$, are non-terminals and $a$ is a terminal. Suppose $G$ is a CFG in CNF and $w$ is a string in $L(G)$ of length $n$, then how long is a derivation of $w$ in $G$?

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