The answer that you are looking for is B. 1/4.
The length of XZ is likely 8 i think since they are in that order, but idk. sorry if im wrong, and i hope this helped ):
nCp = n! / (p!)*(n-p)!
so 12C8 = 12! / (8!)*(4!)
= 11880 / 24
= 495
ans is C
Here is a photo of how I got the answer and what the answer is (Red and blue represent my work, while highlighter shows what the answer is):
Step-by-step explanation:
90:120
9:12
3:4
Topic: ratio n proportions
If you like to venture further, do check out my insta (learntionary) where I constantly post math tips! Thanks!