Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
xy_z_xxy_zbx_yx_bx_y_z_x
1
xzxxyyzx
2
xyxxzxxb
3
xbxxzxxb
4
xbxyzxxb
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
xy_z_xxy_zbx_yx_bx_y_z_x