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Odd Man Out Series

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ODD MAN OUT -> EXERCISE

1. Insert the missing number :
2, 6, 12, 20, 30, 42, 56, (.....)
 
  • A. 60
  • B. 64
  • C. 72
  • D. 70
Ans: C.
Sol.
The pattern is 1 × 2, 2 × 3, 3 × 4, 4 × 5, 5 × 6, 6 × 7, 7 × 8.
So, the next numbers is 8 × 9 = 72.
 
 
2. Find the odd man out :
16, 25, 36, 72, 144, 196, 225
 
  • A. 36
  • B. 72
  • C. 196
  • D. 225
Ans: B.
Sol.
Each of the numbers except 72, is a perfect square.
 
3. Find the odd man out :
2, 5, 10, 50, 500, 5000
 
  • A. 0
  • B. 5
  • C. 10
  • D. 5000
Ans: D.
Sol.
Pattern is 1st × 2nd = 3rd;
2nd × 3rd = 4th;
3rd × 4th = 5th;
But, 4th × 5th = 50 × 500 = 25000 ‡ 5000 = 6th.
 
4. Find out the wrong number in the series :
19, 26, 33, 46, 59, 74, 91
 
  • A. 26
  • B. 33
  • C. 46
  • D. 59
Ans: B.
Sol.
Go on adding 7, 9, 11, 13, 15, 17 respectively to obtain the next number. So, 33 is wrong.
 
 
5. Find the odd man out :
253, 136, 352, 460, 324, 631, 244
 
  • A. 136
  • B. 324
  • C. 352
  • D. 631
Ans: B.
Sol.
Sum of the digits in each number, except 324 is 10.