ODD MAN OUT SERIES

Find the odd man out?

1. 396, 462, 572, 427, 671, 264

• 671
• 462
• 427

2. 3, 5, 7, 12, 17, 19

• 19
• 17
• 5
• 12

3. 10, 14, 16, 18, 21, 24, 26

     Ans: 21(Each of the numbers except 21 is an even number).

4. 3, 4, 13, 38, 87, 166, 289

    a. 38

    b. 13

    c. 87

    d. 166

    e. 4

The difference between consecutive numbers in the series are the squares of odd numbers.

For example, 4 - 3 = 1

13 - 4 = 9

38 - 13 = 25

87 - 38 = 49

168 - 87 = 81

289 - 168 = 121

Hence the number which is wrong in the series is 166 (it should be 168)

5. 6, 9, 15, 21, 24, 28, 30
     a. 21
     b. 28

6. 10, 25, 45, 54, 60, 75, 80
     a. 10
     b. 45
     c. 54
     d. 75

7. 36, 54, 18, 27, 9, 18.5, 4.5
    a. 4.5
    b. 18.5
    c. 54
    d. 18

The terms (except 18.5) are alternatively multiplied by 1.5 and divided by 3. 

8. a. 36

     b. 49

     c. 64

     d. 81

36, 64, 81 and 100 are squares of composite numbers, but not 49.

9. 2, 5, 10, 17, 26, 37, 50, 64

    a) 50 b) 37

    c) 26 d) 64

(1*1)+1, (2*2)+1, (3*3)+1, (4*4)+1, (5*5)+1, (6*6)+1, (7*7)+1, (8*8)+1. But, 64 is out of pattern.

10. 582, 605, 588, 611, 634, 617, 600
      a. 634
      b. 605
      c. 611

      d. 600
Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.