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Number Series in SSC CGL can be one of the easiest scoring questions if one knows all the tricks and formulae. Every year almost 1-2 questions are asked from concepts related to Number Series. Candidates appearing in SSC CGL must follow the rules and preparation tips thoroughly to save time and score more at the time of examination. Identifying the logic behind the sequence can be tough and only practice will ease things out.
One of the tough aspects or challenge faced by candidates is that they tend to spend undue time in trying to solve these questions thereby having less time to focus on other questions.
With regular practice and guidance from recommended books and websites, candidates can greatly improve their performance in SSC CGL examination.
Questions based on completing the pattern, finding the missing term and finding the error in the sequence are asked.
Almost infinite numbers of patterns are possible in the Number Series Questions. Given below are patterns of some of the frequently asked questions in SSC CGL Examination.
A series of prime number constitute the sequence.
A series of alternate prime numbers constitute the sequence.
Example: 2, 5, 9, 13
A series of perfect squares and cubes constitute the sequence.
Example: 8, 27, 64,125
A pattern is established wherein the difference between consecutive numbers in the sequences is a constant.
Example: 1,4,7,10,13 (difference between consecutive numbers is 3, therefore the following number will be 16)
A pattern is established where the next number is obtained as the sum of the preceding two numbers.
Example: 2, 3, 5,8,13 next number is 13+8=21)
In this type, the next number is obtained as the product of the preceding two numbers.
Example: 1, 2,2,4,8
In this type, the sequence consists of one number that does not fit the pattern established by other numbers in the sequence.
Example: 5, 10, 12, 15, 20 (here all numbers except, 12 are multiples of 5)
In this type, the pattern is set by differences in consecutive numbers. The differences are increasing/ decreasing by a constant number.
Example: 1, 7, 19, 37 (difference between the numbers is 6, 12, 18, hence the difference between next numbers has to be 24, which means next number will be 61)
In this type, the sequence consists of numbers which are obtained after being multiplied by an increasing/decreasing sequence.
For example – 2, 4, 12, 48… (Here the first number is multiplied by 2, the second number by 3 and the third number by 4, hence next number has to be multiplied by 5, which means next number will be 240)
In such cases, the pattern is established by differences between numbers. Rather than the differences between consecutive numbers being fixed, the differences exhibit a dynamic pattern. There is still a well defined logical rule that the sequence follows.
And hence next number will be 90*3-4=266
One of the major challenges faced by students when solving questions from Number Series concepts is the management of time. These questions might consume loads of undue time thereby leaving candidates with little or no time for questions from other high scoring concepts.
Since most of the questions are framed from basic fundamentals, the question themselves do not seem tough to solve. But at times, figuring out the logic behind a sequence can be tricky. Time management of such sections can have a huge influence in the overall score of candidates.
It therefore becomes vital for candidates to be well versed with all possible types of questions from Number Series and practice tough questions on a daily basis to improve speed and accuracy.
|What should come in place of the question mark (?) in the following number series? 2916, 972, ? , 108, 36, 12|
|321||234||324 (Ans)||None of these|
|The wrong term in the sequence 7, 28, 63, 124, 215, 342, 511 is|
|What will come in place of question mark in the following number series? 8,27,125, ? , 1331|
|In the following question, identify the wrong number in the series. 5, 13, 29, 61, 120, 253|
|Choose the correct alternatives from the given ones to complete the series: 1, 5, 4, 10, 8, 15?|
|Given below is a series which is incomplete, which of the given alternatives completes the series? 2, ?, 8, 16, 32|
|Name of the book||Author||Publisher||ISBN|
|Quantitative Aptitude for Competitive Examinations||R.S. Aggarwal||S.Chand||8121924987|
|SSC Mathematics Topic-wise Latest 32 Solved Papers (2010-2016)||Disha Experts Team||Disha Publications||9386323230|
Candidates can visit the following websites which have dedicated sections towards addressing basics of number series, tips to solve number series, sample questions. Candidates can practice all the material there to get a firm grip over all concepts and aspects related to number series.
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