# NIELIT 2016 DEC Scientist B - Section A: 21

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In the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

$\text{aaa_bb_ aab_baaa_bb}$

1. $\text{abab}$
2. $\text{bbaa}$
3. $\text{babb}$
4. $\text{baab}$

$aaa\_bb\_ aab\_baaa\_bb$

There are $18$ slots.

We can divide into three groups.

$aaa{\color{Red}{b} }bb\mid {\color{Blue}{a} }aab{\color{Red}{b} }b \mid aaa{\color{Red}{b} }bb$

So, the correct answer is $(C).$
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