Which of the following letter number-clusters will replace the question mark (?) in the given series to make it logically complete?
LR35 NT42 PV49 RX56 ?
ATZ64
BTY64
CTZ63
DTY63
ATZ64
BTY64
CTZ63
DTY63
Related Questions:
What would come at the place of question mark in the number series ?
2 , 10 , 30 , 68 , ?