Which of the following letter cluster will replace the question mark (?) to complete the given series?
PTX, AEI, LPT, ?
In each letter, 11 is added to obtain the next one.Â
PTX ==>Â (P+11) (T+11)Â (X+11) ==>Â AEI
AEI ==>Â (A+11)Â (E+11)Â (I+11) ==>Â LPT
LPT ==>Â (L+11) (P+11) (T+11) = WAE
Hence 'WAE' will come in place of the question mark.
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