Question

Complete the series choosing the missing letter/s: 

a _ cd _ cda _ dab _ abc 

1. cdbb
2. bbcd
3. bcdb
4. bcdd

Answer 1

Correct Answer - Option 2 : bbcd

The given series:

a _ cd _ cda _ dab _ abc

a

c

c

d

d

c

d

a

b

d

a

b

b

a

b

c

a

b

c

d

b

c

d

a

c

d

a

b

d

a

b

c

a

b

c

d

c

c

d

a

d

d

a

b

b

a

b

c

a

b

c

d

c

c

d

a

d

d

a

b

d

a

b

c

There are 16 terms in the series with four different letters being repeated, which implies a pattern of 4 letters.

In option 2, there is a pattern formation of cyclic repeating letters starting from the next letters. 

⇒ abcd / bcda / cdab / dabc

First group four letters start with a

Second group four letters start with b

Third group four letters start with c

Fourth group four letters start with d

Hence, 'bbcd' will replace the blanks in the given series.