Number Series Questions

Q:

Look at the series :

3, 7, 24, 11, __, 19, 19,... What number should fill the blank ?

A) 15 B) 13
C) 21 D) 16
 
Answer & Explanation Answer: A) 15

Explanation:

Two series alternate here, with every third number following a different pattern.
In the main series, 4 is added to each number to arrive the next.
In alternate series, 5 is subtracted from each number t arrive the next number.
Here in the main series
3 + 4 = 7
7 + 4 = 11
11 + 4 = 15
15 + 4 = 19

In alternate series
24 - 5 = 19
19 - 5 = 14...

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39 32505
Q:

What will come in the place of the (?) in the following number series ?

5 14 45 130 (?) 1182

A) 222 B) 397
C) 404 D) 415
 
Answer & Explanation Answer: B) 397

Explanation:

The pattern of given series is :

5

14 = (5x3) - 1

45 = (14x3) + 3

130 = (45x3) - 5

(?) = (130x3) + 7

=> (?) = 397

1182 = (397x3) - 9

Thus, the missing number is 397.

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54 31423
Q:

What is the number that should come in the place of question mark ?

1050    420    168     67.2     ?

A) 19.11 B) 14.25
C) 10.752 D) 26.88
 
Answer & Explanation Answer: D) 26.88

Explanation:

Given series follows the rule of

1050/2.5 = 420
420/2.5 = 168
168/2.5 = 67.2
so 67.2/2.5 = 26.88

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36 31251
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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420 29506
Q:

Find the next number in the given sequence?

1, 2, 6, 21, 88, ?

A) 445 B) 364
C) 296 D) 194
 
Answer & Explanation Answer: A) 445

Explanation:

The given series is 1, 2, 6, 21, 88, ?

1

1 x 1 + 1 = 2

2 x 2 + 2 = 6

6 x 3 + 3 = 21

21 x 4 + 4 = 88

88 x 5 + 5 = 445

 

Hence, the next number in the given number sequence is 445.

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39 29322
Q:

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

312      231      295      ?      282      257

A) 210 B) 25
C) 246 D) 279
 
Answer & Explanation Answer: C) 246

Explanation:

The series follows a pattern that,

-92, +82, -72, +62, -52

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55 28549
Q:

CGE, RNP, FJH, OKM, IMK, __

 

A) JHL B) HJL
C) LHJ D) JKL
 
Answer & Explanation Answer: C) LHJ

Explanation:

Here it can be seen that it is not a continuous series.

so take alternative terms.

CGE, FJH, IMK and RNP, OKM,__

Between R and O there is a gap of two letters. so the first letter in the answer is L.Proceding like this the answer is LHJ

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22 28448
Q:

Find the next number in the given number sequence?

101, 98, 93, 86, 75, ?

A) 62 B) 68
C) 71 D) 73
 
Answer & Explanation Answer: A) 62

Explanation:

The given number sequence is 101, 98, 93, 86, 75, ?

101

101 - 3 = 98

98 - 5 = 93

93 - 7 = 86

86 - 11 = 75

75 - 13 = 62

 

Here the series follows a pattern that consecutive subtraction of prime numbers.

 

Hence, the next number in the sequence is 62.

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16 28240