Which term from among the given options can replace the question mark (?) in the following series to make it logically complete?
UC 169, WE 121, ?, AI49, CK25
1
YF64
2
XH81
3
XF64
4
YG81
Which term from among the given options can replace the question mark (?) in the following series to make it logically complete?
UC 169, WE 121, ?, AI49, CK25