A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
G2Z7, X3H7, I5V7, T7J9, ?

Let's split each term into its constituent components and find their patterns:
1. First Letter: G, X, I, T, ...
* Look at alternating terms:
* G ($7$) $\to$ I ($9$) [+2] $\to$ Next should be K ($11$)
* X ($24$) $\to$ T ($20$) [-4]

* Thus, the first letter of the missing term is K.

2. First Number: 2, 3, 5, 7, ...
* This is the sequence of consecutive prime numbers.
* The next prime number after $7$ is 11.

3. Second Letter: Z, H, V, J, ...
* Look at alternating terms:
* Z ($26$) $\to$ V ($22$) [-4] $\to$ Next should be R ($18$)
* H ($8$) $\to$ J ($10$) [+2]

* Thus, the second letter of the missing term is R.

Combining these parts, the missing term must begin with K11R. Looking at the options, only K11R12 matches this pattern perfectly.