Select the combination of letters that when sequentially placed in the blanks of the given series, will complete the series.
QRST _ Q _ SS _ QR _ STQQ
1
QTTQ
2
QRQT
3
TRTR
4
RTTS
Select the combination of letters that when sequentially placed in the blanks of the given series, will complete the series.
QRST _ Q _ SS _ QR _ STQQ