In each of the following questions, a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
AZ ,YB ,CX ,?
In the given series the next term is obtained by moving the letters of previous term starting from A one step forward and letters starting from Z one step backward
and then interchanging their positions
The series is
AZ
A+1,Z-1 = BY which after interchanging becomes YB
Similarly Y-1 , B+1 = XC which after interchanging becomes CX
C+1,X-1 = DW which after interchanging becomes WD
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