# Series Completion

## Series Completion of Class 10

Series completion problems deal with numbers, alphabets and both. While attempting to solve the question, you have to check the pattern of the series. Series moves with certain mathematical operations. You have to check the pattern

Type of questions asked in the examination :

•  Find the missing term(s)
• Find the wrong-term(s)

### NUMBER SERIES

1. a, a ± d, a ± 2d, a ± 3d ............................(Arithmetic Progression)
2. a, a k, ak2, ak3, ........................................(Geometric Progression)
3. a, a/k, a/k2, a/k3 .............................................(Geometric Progression)
4. Series of prime numbers i.e. 2, 3, 5, 7, 11,...............................
5. Series of composite numbers i.e. 4, 6, 8, 9, 10, 12, .................

### ALPHABET SERIES (SERIES OF LETTERS)

Pattern of alphabets show variation based on :

(i) Position of the letters

e.g. A, C, E, G, I

(ii) Difference between the alphabets

e.g. F3X, H7U, J15R

## LETTER REPEATING SERIES

Pattern of such questions is that some letters in the sequence are missing.

(i) The letters may be in cyclic order (clockwise or anti-clockwise).

(ii) To solve a problem, we have to select one of the alternative from the given alternatives. The alternative which gives a sequence form of letters is the choice.