# Series Questions

Q:

Find the missing number in the series?

4, 18, ?, 100, 180, 294, 448

 A) 48 B) 50 C) 58 D) 60

Explanation:

Take a Look at this series :

${2}^{3}$ - ${2}^{2}$ =  8 - 4 = 4

${3}^{3}$ - ${3}^{2}$ = 27 - 9 = 18

${4}^{3}$ - ${4}^{2}$ = 64 - 16 = 48

${5}^{3}$ - ${5}^{2}$ = 125 - 25 = 100

${6}^{3}$ - ${6}^{2}$ = 216 - 36 = 180

${7}^{3}$ - ${7}^{2}$ = 343 - 49 = 294

${8}^{3}$ - ${8}^{2}$ = 512 - 64 = 448

285 17577
Q:

Find the missing number in the following series?

3, 5, 5, 19, 7, 41, 9, ?

 A) 71 B) 61 C) 79 D) 69

Explanation:

Fiest series : 3, 5, 7, 9

Second series : 5, 19, 41, ?

Difference of Second series are 14, 22, 30 etc

Next term is 41+30 i.e equal to 71

127 16283
Q:

1, 2, 3, 10, ?, 9802

 A) 99 B) 199 C) 299 D) 999

Explanation:

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288 14735
Q:

Find out the wrong term in the series 2, 3, 4, 4, 6, 8, 9, 12, 16

 A) 9 B) 12 C) 16 D) 8

Explanation:

The given sequence is a combination of three series:
i)1st, 4th, 7th terms i.e, 2, 4, 9
ii)2nd, 5th, 8th terms i.e, 3, 6, 12
iii)3rd, 6th, 9th terms i.e, 4, 8, 16
In each one of i, ii, iii, each term is twice the preceding term.
So, 9 is wrong and must be replaced by (4*2) = 8

128 11615
Q:

In the following question, various terms of an alphanumerical series are given with one or more terms missing as shown by (?).Choose the missing terms out of the given alternatives. 2Z5, 7Y7, 14X9, 23W11, 34V13, ?

 A) 47U15 B) 47V14 C) 45U15 D) 27U24

Explanation:

The first numbers increase by 5, 7, 9, 11....
The letters move one step backward.
The last numbers are consecutive odd numbers.

292 10938
Q:

Find the wrong number in the series.

1, 2, 6, 15, 31, 56, 91

 A) 31 B) 15 C) 56 D) 91

Explanation:

The difference of the two consecutive numbers are 1, 4, 9, 16, 25, 35.

This is clearly ,

Here 35 is wrong, So our wrong number is 91

75 10660
Q:

Find out the wrong term in the series 2, 5, 10, 50, 500, 5000

 A) 5000 B) 500 C) 10 D) 50

Explanation:

Each term of the series is the product of the preceding two terms
So, 5000 is wrong and it must be replaced by (500*50) = 25000

241 10350
Q:

8, 15, 28, 53, ?, 199

 A) 101 B) 102 C) 103 D) 104

Explanation:

Here the series of the form is

53 x 2 - 4 = 106 - 4 = 102