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Quantitative Ability - Odd Man Out and Series

Calender Icon CAT Registration Ends: 13th September 2023

Odd One Out Questions For CAT

CAT 2022 is being conducted in November 2022. Practice with following Odd One Out Questions For CAT and Series Questions with solutions:

 
Quantitative Ability - Odd Man Out and Series
 

Directions to Solve
Find out the wrong number in the series:

Question 1)
190, 166, 145, 128, 112, 100, 91

A) 100

B) 166

C) 145

D) 128

E) 112

Answer - Option D

Solution:
Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.
190 - 24 = 166
166 - 21 = 145
145 - 18 = 127 [Here, 128 is placed instead of 127]
127 - 15 = 112
112 - 12 = 100... and son on.
Therefore, 128 is wrong


Question 2) 

1, 3, 10, 21, 64, 129, 356, 777

A) 10

B) 21

C) 64

D) 129

E) 356

Answer - Option E

Solution:

A x 2 + 1, B x 3 + 1, C x 2 + 1, D x 3 + 1  and son on. So, 356 is wrong.

Question 3)

6, 12, 48, 100, 384, 768, 3072

A) 768

B) 384

C) 100

D) 48

E) 12

Answer - Option C

Solution:

Each even term of the series is obtained by multiplying the previous term by 2.
2nd term = (1st term) x 2 = 6 x 2 = 12

4th term = (3rd term) x 2 = 48 x 2 = 96

6th term = (5th term) x 2 = 384 x 2 = 768

Therefore, 4th term should be 96 instead of 100

Question 4)

40960, 2560, 640, 200, 40, 10

A) 640

B) 40

C) 200

D) 2560

E) 10240

Answer: Option C

Solution:

Go on diving by 4 to get the next number. So, 200 is wrong.

Question 5)

10, 26, 74, 218, 654, 1946, 5834

A) 26

B) 74

C) 218

D) 654

E) 1946

Answer: option D

Solution:

2nd term = (1st term) * 3-4 = 10*3-4 = 26.

3rd term = (2nd term) * 3-4 = 26*3-4 = 74.

4th term = (3rd term) * 3-4 = 74*3-4 = 218.

5th term = (4th term) * 3-4 = 218*3-4 = 650.

Thus, 5th term must be 650 instead of 654

Question 6)

15, 16, 34, 105, 424, 2124, 12576

A) 16

B) 34

C) 105

D) 424

E) 2124

Answer:  Option E

Solution:

2nd term = (1st term) * 1+1 = 15*1+1 = 16.

3rd term = (2nd term) * 2+2 = 16*2+2 = 34.

4th term = (3rd term) * 3+3 = 34*3+3 = 105.

5th term = (4th term) * 4+4 =105*4+4 = 424.

6th term = (5th term) * 5+5 = 424*5+ 5 = 2125

Therefore, 6th term should 2125 instead of 2124

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