Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
r s_t_r_s t q_s s_q
1
q r q t s
2
r r s t q
3
t r t s r
4
s q s r t
Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
r s_t_r_s t q_s s_q