Question

Select the correct option that will fill in the blank and complete the series. AB, BA, ABC, CBA, ABCD, _____.
1. DCBA
2. CABD
3. ACBD
4. BACD

Answer 1

Correct Answer - Option 1 : DCBA

The given series-

AB, BA, ABC, CBA, ABCD, ?

First is AB, then reverse the order BA, then reverse the order and add C i.e. ABC and so on

The next step is DCBA.

Hence, option 1 is the correct answer.