Number Series
 4, 28, 160, 990, 6970,55832, 502560

 160
 990
 55832
 6970
 None of these

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4 x 4 + (4 x 3) = 28
28 x 5 + (5 x 4) =160
160 x 6 + (6 x 5) = 990
990 x 7 + (7 x 6) = 6972
6972 x 8 + (8 x 7) = 55832
55832 x 9 + (9 x 8) = 502560Correct Option: D
4 x 4 + (4 x 3) = 28
28 x 5 + (5 x 4) =160
160 x 6 + (6 x 5) = 990
990 x 7 + (7 x 6) = 6972
6972 x 8 + (8 x 7) = 55832
55832 x 9 + (9 x 8) = 502560
 13, 14, 27, 45, 68, 109, 177

 27
 109
 45
 68
 None of these

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13 + 14 = 27
14 + 27 = 41
27 + 41 = 68
41 + 68 = 109
68 + 109 = 117
So, 45 is the wrong number in this series.Correct Option: C
13 + 14 = 27
14 + 27 = 41
27 + 41 = 68
41 + 68 = 109
68 + 109 = 117
So, 45 is the wrong number in this series.
 529, 841, 961, 1296, 1681, 1849, 2209

 1296
 841
 961
 1681
 None of these

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All nos, in the given series are squeres of odd nos, except 1296
1296 = (36)^{2}Correct Option: A
All nos, in the given series are squeres of odd nos, except 1296
1296 = (36)^{2}
Direction: In each of these questions a number series is given. Only one number is wrong in each series. You have to find out the wrong number.
 1 , 3 , 4 , 7 , 11 ,18 , 27 , 47

 4
 11
 18
 7
 27

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As per the details in the question the series is in the form of
The sum of the first two nos. is the third no.
First term + Second term = Third term
Second term + Third term = Fourth term
Similarly , we can calculate all others terms also.Correct Option: E
As per the details in the question the series is in the form of
The sum of the first two nos. is the third no.
∴ First term + Second term = Third term
⇒ 1 + 3 = 4 ;
Second term + Third term = Fourth term
⇒ 3 + 4 = 7 ;
Third term + Fourth term = Fifth term
⇒ 4 + 7 = 11 ;
Fourth term + Fifth term = Sixth term
⇒ 7 + 11 = 18 ;
Fifth term + Sixth term = Seventh term
⇒ 11 + 18 = 27 is wrong. It should be 29.
Sixth term + Seventh term = Eighth term
⇒ 18 + 29 = 47
Hence, 27 is wrong. It should be 29.
 3 , 2 , 3 , 6 , 12 , 37.5 , 115.5

 37.5
 3
 6
 2
 12

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The given series is in the below pattern,we can see that
Next term= ( Previous term × variable ) + variable
First term = 3
Second term = ( First term × variable ) + 0.5 = ( 3 x 0.5 ) + 0.5 = 2
Third term = ( Second term × variable ) + 1 = ( 2 x 1 ) + 1 = 3
Similarly , we can calculate all others terms also.Correct Option: E
The given series is in the below pattern,we can see that
Next term= ( Previous term × variable ) + variable
First term = 3
Second term = ( First term × variable ) + 0.5 = ( 3 x 0.5 ) + 0.5 = 2
Third term = ( Second term × variable ) + 1 = ( 2 x 1 ) + 1 = 3
Similarly , we can calculate all others terms also.
Fourth term = ( Third term × variable ) + 1.5 = ( 3 × 1.5 ) + 1.5 = 6 ;
Fifth term = ( Fourth term × variable ) + 2 = ( 6 × 2 ) + 2 = 12 ; 12 is wrong. It should be 14.
Sixth term = ( Fifth term × variable ) + 2.5 = (14 × 2.5 ) + 2.5 = 37.5 ;
Seventh term = ( Sixth term × variable ) + 3 = ( 37.5 × 3 ) + 3 = 115.5
Hence, 12 is wrong. It should be 14.