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Odd Man Out

Aptitude

ODD MAN OUT -> EXERCISE

11. Find out the wrong number in the series :
1, 1, 2, 6, 24, 96, 720
 
  • A. 6
  • B. 24
  • C. 96
  • D. 720
Ans: C.
Sol.
Go on multiplying with 1, 2, 3, 4, 5, 6 to get the next number.
So, 96 is wrong.
 
12. Find out the wrong number in the series :
3, 7, 15, 39, 63, 127, 255, 511
 
  • A. 7
  • B. 15
  • C. 29
  • D. 63
Ans: C.
Sol.
Go on multiplying 2 and adding 1 to get the next number.
So, 39 is wrong.
 
13. Find out the wrong number in the series :
4, 5, 15, 49, 201, 1011, 6073
 
  • A. 5
  • B. 15
  • C. 49
  • D. 201
Ans: A.
Sol.
2nd term = (1st term × 1 + 2) = (4 × 1 + 2) = 6;
3rd term = (2nd term × 2 + 3) = (6 × 2 + 3) = 15;
4th term = (3rd term × 3 + 4) = (15 × 3 + 4) = 49;
5th term = (4th term × 4 + 5) = (49 × 4 + 5) = 210; and so on.
Therefore 5 is wrong.
 
14. Find out the wrong number in the series :
190, 166, 145, 128, 112, 100, 91
 
  • A. 100
  • B. 166
  • C. 145
  • D. 128
Ans: D.
Sol.
Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.
Clearly, 128 is wrong.
 
15. Find out the wrong number in the series :
196, 169, 144, 121, 100, 80, 64
 
  • A. 169
  • B. 144
  • C. 121
  • D. 80
Ans: D.
Sol.
Numbers must be (14)2, (13)2, (11)2, (10)2, (9)2,(8)2.
So, 80 is wrong.