12 10 8 7 =34
32 23 7 9 = 13
34 43 9 10 =??
option (1) 23 (2) 16 (3)15 (4)13
Answers
Generally, two kinds of series are asked in the examination. One is based on numbers and the other based on alphabets.
In questions based on series, some numbers or alphabets are arranged in a particular sequence. You have to decipher that particular sequence of numbers or alphabets and on the basis of that deciphered sequence, find out the next number or alphabet of the series. Although there is no limit of logics which can be used to build a series, here are some important examples given which highlight the type of series asked in the examination.
How to solve number series problems:
Step 1: Observer are there any familiar numbers in the given series. Familiar numbers are primes numbers, perfect squares, cubes ... which are easy to identify.
Examples:
a. Prime number series: 2, 3, 5, 7, 11, 13, 17, . . .
b. Square series : 1, 4, 9, 16, 25, 36, 49, . . .
c. Cube series: 1, 8, 27, 64, 125, 216, 343, 512, 729, . . .
d. series: 0, 3, 8, 15, 24,35, 48,
e. series: 2, 6, 12, 20, . . . .
Another Logic : The series is 1 x 2, 2 x 3, 3 x 4, 4 x 5, The next number is 5 x 6=30.