Question

In the following questions, a letter series is given, in which some letters are missing. The missing letters are given in the proper sequence as one of the alternative. Find the correct alternative.

$BC....B....C....B....CCB$

• A. $BBCB$
• B. $CBBC$
• C. $CBCB$
• D. $BCBC$
• E. $CCBB$

Answer 1

Answer: (C)

$CBCB$

We look at the last of the sequence

$BC...B...C...B...CCB$

The last part indicates that the repeating unit must have $CCB$ in it.

CASE 1: Let repeating unit be of 3 characters only.

Then automatically the unit becomes $CCB$

This is automatically inconsistent with the first character in the series ${}^{\prime }B{}^{\prime }$.

so this case fails.

CASE 2: repeating unit is of 4 characters.

Thus the unit becomes $...CCB$

This is consistent and by putting it in the seires, we find the repeating unit is $BCCB$

Comparing the blanks:

The answer becomes $CBCB$

Thus $\left(C\right)$ is the answer.