129+ Number Series Questions and Answers

Q:

Find the missing number in the series?

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

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

Answer & Explanation Answer: A) 48

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

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1760 114250

Q:

Find the missing number in the following series?

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

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

Answer & Explanation Answer: A) 71

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

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877 107175

Q:

1, 2, 3, 10, ?, 9802

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

Answer & Explanation Answer: A) 99

Explanation:

$2 = 1^{2} + 1 3 = 2^{2} - 1 10 = 3^{2} + 1 N o w 10^{2} - 1 = 99 9802 = 99^{2} + 1$

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793 52390

Q:

Find the wrong number in the series.

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

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

Answer & Explanation Answer: D) 91

Explanation:

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

This is clearly , $+ (1^{2}), + (2^{2}), + (3^{2}), + (4^{2}), + (5^{2}), + (6^{2})$

Here 35 is wrong, So our wrong number is 91

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496 94727

Q:

What should come in place of question mark (?) in the following number series?

132 156 ? 210 240 272

A) 196	B) 182
C) 199	D) 204

Answer & Explanation Answer: B) 182

Explanation:

The given series follows a logic that

11 x 12, 12 x 13, 13 x 14, 14 x 15, 15 x 16,...

So the missing number is 13 x 14 = 182

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436 97168

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

Answer & Explanation Answer: A) 9

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

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401 34872

Q:

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

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

Answer & Explanation Answer: A) 5000

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

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393 24934

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

Answer & Explanation Answer: A) 47U15

Explanation:

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

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