In soil plaque method of soil fertility assessment

Study the given pattern carefully and select the number that can replace the question mark (?) in it:

Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.

abc_dab_ _d_b_cdab_c_

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

B _ _ E N _ Y U _ N _ Y _ _ N

Select the option that represents the letters that, when sequentially placed from left to right in the blanks below, will complete the letter ser ies.

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.

RQP, ONM, ____, IHG, FED, find the missing letters

Select the combination of letter that when sequentially placed in the blanks of the given series will complete the series.

Select the number combination of letters that when placed sequentially in the blanks of the given series will complete the series.