SSC CHSL 29 JAN 2017 SHIFT 3 TIER 1 REASONING QUESTION 10

10.series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
ABC, PQR, DEF, STU, ?
Options:
1) VWX
2) GHI
3) IJK
4) GKL

Ans: 2 GHI

Sol: ABC(1), PQR(1), DEF(2), STU(2), ?. ?
There are 2 series
one is: ABC, DEF, GHI ...
Second is: PQR, STU, VWX ...