Latest self Aptitude Question SOLUTION: Find out the wrong term in the series given below:- 11, 5, 20, 12, 40, 26, 74, 54

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(#M40007747) SELF question numbers Keep an EYE

Find out the wrong term in the series given below:-
11, 5, 20, 12, 40, 26, 74, 54

K BASHA (12 years ago)

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Phaneendra Sandeep  (12 years ago)

consider alternate numbers.
5 12 26 54, differences are doubling 7 14 28.
for 11 20 40 74 differences are 9 20 34
if number 40 is made 38
11 20 38 74, differences are 9 18 36
so wrong term is 40.

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Pargat Pal Singh  (12 years ago)

38 is wrong term.

11, 5, 20, 12, 40, 26, 74, 54

two series are
11,20,40,74 ...
and
5,12,26,54

In case of 11,20,40,74 ...
20 = 11*2-2
next number should be 20*2-2=38
as 74= 38*2-2

so wrong term is 40 which should be 38.

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B.Senthil Kumar  (12 years ago)

Take the pair of terms
11+5=16
20+12=32
40+26=66
74+24=128
Except the pair(40,26) all other are divisible by 16
12-5=7
26-12=14
54-26=28
from the above we know that 26 is placed correct
so the answer is 40

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Manavalan K R  (12 years ago)

Take the alternate terms:
11, 20, 40, 74
and 5, 12, 26, 54

The difference between the first sequence of nos. are

11 (9) 20 (20) 40 (34) 74 ---------- A

and 5 (7) 12 (14) 26 (28) 54 ----------- B

From ' B ' we can see that the difference between the nos.(i.e. within brackets) are increasing by double...

Similarly, for ' A ' also to exhibit the similar property, 40 should be corrected to "38"...

Hence sequence ' A ' will become,

11 (9) 20 (18) 38 (36) 74

Now we can see that the difference between the nos. make sense!!!!

40 is the faulty no. Make it 38...

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