Letter Repeating Series
In the questions on Letter Repeating Series, a series or a bead of alphabets are present. Some of these strings or sequences of alphabets will have missing spaces at regular or irregular places. You will have to complete this sequence in a way that not only makes a regular series but also fits with one of the options. We will also see a shortcut method that will definitely save you a lot of time and guarantee a high rate of success in solving the questions.
Let us first start with a series and note down all the parameters that we can get from it. The following is an example of the letter repeating series that you will surely encounter in the IBPS PO, SO, SBI PO, RBI, NABARD exams and other such banking exams.
Example 1: In the following question, a number of letters are given. There are blanks which can be filled with the help of the letters of the options below. Pick the correct option and complete the series:
Q 1: _ aa _ ba _ bb _ ab _ aab
A) aaabb B) babab C) bbaab D) bbbaa
Answer: There are two methods of doing these series which we will discuss in the following sections. Here let us just say that this is how the series looks. The answer to this is the option C). Let us see how we can get there.
The Easy Way
The easiest way to solve these questions is to put the options back into the blanks. It is a reverse method of solving these questions but it always works. It is fast and will save you a lot of time but it doesn’t always work. We will see in the following section, examples that are of a more difficult nature and won’t be good to solve them this way. But let us see if this method works for the above example. The sequence is _ aa _ ba _ bb _ ab _ aab. Let us try option A).
For the option A),
the series can be written as: aaaa | baab | bbab | baab – which is not any sequence.
For the option B),
the series becomes: baaa | babb | baab | baab – which also isn’t a series.
Similarly, you can see for option C) and D).
Out of the two, option C) makes a sequence as baab | baab | baab | baab.
Two Correct Options
Example 3: Complete the series ab_dda__cda__cda:
A) dcdcc B) ccddc C) cbcbb D) cccbb
Just have a try first before viewing the answer
If u still don't get the answer then check for the answer below and practice more.
Answer: You will see that the answer can either be c or d. However, if you start substituting the options, it might get a bit messy. Let us see the method that we have learnt. The series has 16 terms which can be divided into 2, 4, 8 terms taken at once. There are a total of 4 different types of letters. So let us start with groups of 4 letters. The series is:
ab_d | da__ | cda_ | _cda – The series has a double gap which makes it difficult to solve. We see that the option D) doesn’t make anything click. The correct option hence is C) cbcbb and the series is abcd | dabc | cdab | bcda which is a sequence.
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