Sawaal
2033
Q:

Find the missing number in the series?

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

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

Answer:   A) 48



Explanation:

Take a Look at this series :

 

23 - 22 =  8 - 4 = 4  

33 - 32 = 27 - 9 = 18 

43 - 42 = 64 - 16 = 48  

53 - 52 = 125 - 25 = 100  

63 - 62 = 216 - 36 = 180 

73 - 72 = 343 - 49 = 294 

83 - 82 = 512 - 64 = 448

Subject: Number Series
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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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Find out the wrong term in the series 3, 7, 15, 39, 63, 127, 255, 511

A) 39 B) 255
C) 127 D) 63
 
Answer & Explanation Answer: A) 39

Explanation:

The correct pattern is *2+1
So, 39 is wrong and must be replaced by (15 * 2 + 1) = 31

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Find out the wrong term in the series 125, 126, 124, 127, 123, 129

A) 129 B) 125
C) 127 D) 123
 
Answer & Explanation Answer: A) 129

Explanation:

The correct pattern is +1, -2, +3, -4, +5, . . . .
So,129 wrong and must be replaced by 123 + 5 = 128

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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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Q:

Find out the wrong term in the series 83,92,85,90,85,88

A) 85 B) 88
C) 90 D) 92
 
Answer & Explanation Answer: A) 85

Explanation:

The correct pattern is +9,-7,+5,-3,+1
So,85 is wrong term and must be replaced by 90-3=87

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Q:

Find out the wrong term in the series 4,8,15,25,36,54

A) 28 B) 38
C) 30 D) 48
 
Answer & Explanation Answer: B) 38

Explanation:

The correct pattern is +4,+7,+10,+13,+16
So, 36 is wrong term and it must be replaced by 25+13=38

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Q:

Find out the wrong term in the series 169,144,121,100,85,64

A) 144 B) 100
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Answer & Explanation Answer: C) 85

Explanation:

The sequence is 13*13,12*12,11*11,10*10,9*9,8*8, . . . . . .
So,85 is wrong term and must be replaced by 9*81

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10 6260
Q:

Choose the correct alternative that will continue the same pattern and replace 'x' in the series 31,45,35,47,39,x,43,51,47,53

A) 48 B) 49
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Answer & Explanation Answer: B) 49

Explanation:

The given sequence is a combination of two series
1)31,35,39,43,47
2) 45,47,49,51,53
So,the missing term is 49

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Filed Under: Number Series

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