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:

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 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:

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 given series.

8, 27, 125, 343, 1381

A) 27	B) 8
C) 343	D) 1381

Answer & Explanation Answer: D) 1381

Explanation:

Given series follows Cubes on Prime Numbers

i.e $2^{3}, 3^{3}, 5^{3}, . . .$ but $9^{3}$ is 1331

so 1381 is wrong

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100 48284

Q:

Find the wrong number in the series.

3, 8, 15, 24, 34, 48, 63

A) 15	B) 24
C) 34	D) 48

Answer & Explanation Answer: C) 34

Explanation:

The difference between consecutive numbers of the given series are respectively 5, 7, 9, 11, 13, and 15.

Therefore, 24+11=35 But in your problem it is given as 34.so 34 is wrong number

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307 43499

Q:

Find the next number in the given sequence?

11, 17, 39, 85, ?

A) 133	B) 143
C) 153	D) 163

Answer & Explanation Answer: D) 163

Explanation:

Her the given number series is 11, 17, 39, 85, ?

$11 11 + (3^{2} - 3) = 17 17 + (5^{2} - 3) = 39 39 + (7^{2} - 3) = 85 85 + (9^{2} - 3) = 163$

Hence, the next number in the given sequence is 163.

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19 36455

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