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).
9 : 72 : : 6 : ? | |||
| Right Option : C | |||
| View Explanation | |||
Find the missing term: 3, 6, 12, 24, 48, _____. | |||
| Right Option : A | |||
| View Explanation | |||
Find the term. 7,7,14,28,? | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [20]
We started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
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8thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
