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Logical Sequence - Introduction and Examples (with Solutions), Logical Reasoning LR Notes | EduRev

UPSC CSAT Preparation

DI : Logical Sequence - Introduction and Examples (with Solutions), Logical Reasoning LR Notes | EduRev

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Q.1.  E_G_EFF_E_FG_FG_EF
(a) GFGEEE
(b) FGGGEF
(c) FGGEEG
(d) EGFEFG
Ans: c
Solution:
The series follows, +1,+1,+0 addition pattern.
So going by options, we get Option C to be correct.

Try yourself:QQQ_TT__Q_T_Q_Q
View Solution


Q.2. _CAM_AMC_M_A_CAM
(a) CMAMC
(b) MACAM
(c) MCAMC
(d) MCACM
Ans: d
Solution:
This is a Series with MCA blocks repreated.
So, Our series must be
MCA MCA MCA MCA MCA M
Going by Options, We see Option D is correct

Q.3. Find the wrong number in the following series 
6,15,30,75,151,375,750
(a) 151
(b) 75
(c) 375
(d) 750
Ans: a
Solution:
This series follows the rule of *2 and *2+ last term.
15*2 =30
30*2 +15= 75
75*2 = 150.
Thus, 150 is the wrong term.

Q.4. What will be the next term in? 
ZAM, YBL, ----, WDJ, VEI
(a) XCK
(b) UFH
(c) ZAC
(b) PFD
Ans: a
Solution:
Look at the middle term.
We see the following Series.
A B C D E
Thus C is missing.
Going by options, We get A to be correct.

Q.5.  What will be the next term in? 
G, T, I, R, K, P, ___,___
(a) M,N
(b) O,P
(c) Q,R
(d) S,T
Ans: a
Solution:
In the number System of the digits, we see the series relates to an alternating +2,-2 series.
Number the letters, we get the following : 7,20,9,18,11,16. So the next two terms will be 13th and 14th term. Which are : M and N
Thus, Option A.
Try yourself:What will be the next term in?

GHB, KLF, ___, ___, WXN

View Solution


Q.6. Find the wrong number in the given series?
3, 6, 11, 18, 29, 38, 51, 66
(a) 18
(b) 29
(c) 38
(d) 51
Ans: b
Solution:
The next term of the series is denoted by adding consecutive odd terms starting from 3
3+3=6
6+5 =11
11+7=18
18+9=27
27+11 =38
Since we have 29 in place of 27. It is the wrong term

Q.7. Find the wrong number in the given series?
9, 28, 65, 126, 217, 344, 213
(a) 65
(b) 126
(c) 217
(d) 213
Ans: d
Solution:
The series is an increasing series.
213 the last term is a smaller term that the previous one.
Thus it is Wrong.
Try yourself:Find the wrong number in the given series?
4 10 18 29 40 54 70
View Solution

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