The document Introduction to Letter Series Notes | EduRev is a part of the CAT Course Logical Reasoning (LR) and Data Interpretation (DI).

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**The concept of letter series is related to 26 letters of the alphabet series, which are as follows:**

1 2 3 4 5

A B C D E

6 7 8 9 10

F G H I J

11 12 13 14 15

K L M N O

16 17 18 19 20

P Q R S T

21 22 23 24 25

U V W X Y

26

Z

One must know all the positions of the letters on tips.

Therefore, to do that we divided we divided alphabet series in five groups of five letter series of which we have to learn last letter of each group in the initial stage.

5 10 15 20 25

E J O T Y

With the help of these five letters(EJOTY) we will easily get the positions of all other letters of the alphabet series.

**For example:** **Q. Find the letter on following positions:(a) 17 (b) 23 (c) 7 (d) 12**

The above all positions of the letters are from left hand side of the series. One must also know the positions of letters from the right hand side of the series also. Let us check how we will do this:

**For example: **

We know that Letter “A” is on 1st position from left side and “26” form the right hand side. Therefore, the sum of the positions of any letter from both sides will always be 27.

Therefore, to check any position from right hand side, we will first convert that position to left hand side by deducting it from 27.

**Let us practice few more questions:****Q.** **Find the letters on the following positions from right hand side of the alphabet series:(a) 17(b) 23(c) 7 (d) 12**

To find out these positions we will first convert all the positions from the left hand side of the series:

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