Number Series
Number Series
INTRODUCTION: This topic consists of questions in which series of numbers or alphabetical letters or combinations of both are given, which are generally called the terms of the series. These terms follow a certain pattern throughout the series. The candidate is required to study the given series, identify the patterns followed in the series and either complete the given series with the most suitable alternative or find the wrong term in the series.
TYPE 1:
Case I: Completing The Given Series By Finding The Missing Term(s)
Directions: Find the missing term in each of the following series:
Illustration 1: 1, 6, 15, ?, 45, 66, 91
(a) 25 (b) 26 (c) 27 (d) 28
Solution: Clearly, the given sequence follows the pattern : + 5, + 9, + 13, + 17, + 21, + 25,........
Thus, 1 + 5 = 6, 6 + 9 = 15, ........
So, missing term = 15 + 13 = 28.
Hence, the answer is (d).
Illustration 2: 2, 5, 9, 19, 37, ?
(a) 73 (b) 75 (c) 76 (d) 78
Solution: Clearly, we have : 2 X 2 + 1 = 5, 5 X 2 - 1 = 9, 9 X 2 + 1 = 19, 19 X 2 - 1 = 37, ....
So, missing term =
Hence, the answer is (b).
Illustration 3: 10000, 11000, 9900, 10890, 9801,?
(a) 10241 (b) 10423 (c) 10781 (d) 10929
Solution: Clearly , alternatively we add and subtract 10% of a term to obtain the next term of the series.
Thus, 10000 + (10% of 10000) = 11000, 11000 - (10% of 11000) = 9900,
9900 + (10% of 9900) = 10890, 10890 - (10% of 10890) = 9801.
So, missing term = 9801 + (10% of 9801) = 9801 + 980 = 10781.
Hence, the answer is (c).
5, 2, 7, 9, 16, 25, ? | |||
| Right Option : A | |||
| View Explanation |
Find the missing term: 10, 100, 200, 310,? | |||
| Right Option : D | |||
| View Explanation | |||
Find the missing term: 1, 2, 6, 7, 21, 22, 66, 67, ? | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [20]
Third consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
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Om Umang
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Eshan Arora
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Anika Saxena
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Prisha Gupta
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Shreya Shrivastava
8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thMy experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
Hridey Preet
9thWhen I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
Sharandeep Singh
7thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
