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