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Directions: In this type of questions, certain pairs/groups of numbers are given out of which all except one are similar in some manner while one is different. The numbers in these similar pairs/groups may have the same property or may be related to each other according to the same rule. The candidate is required to choose the odd pair/group.
Important for :
1
`Select the one which is different from the other three responses.
» Explain it
D
From the options, we get

1st option:   8 – 11 = 3

2nd option:   1  – 4 = 3

3rd option:   7  – 10 = 3

But

4th option:    3 – 5  = 2

Hence, fourth option is different.


Hence, option D is correct.
 
2
Select the one which is different from the other three responses.
» Explain it
D
Except the number pair (82, 64), in all other number pairs both the numbers are multiples of 3.
 
96 = 32 × 3;    24 = 8 × 3

39 = 13 × 3;    18 = 6 × 3

81 = 27 × 3;    54 = 18 × 3

Hence, option D is correct.

 
3
Select the one which is different from the other three responses.
» Explain it
B
From the options, we get

1st option:   18 – 26 = 8

3rd option:   54  – 62 = 8

4th option:    77  – 85 = 8

But

2nd option:   30 – 37 = 7

Hence, second option is different.

Hence, option B is correct.


4
Select the one which is different from the other three responses.
» Explain it
C
Except (59 - 43), all other numbers subtractions' are odd.

68 – 25 = 43   |
71 – 28 = 43   | Odd numbers
51 – 32 = 19   |

but 

59 – 43  = 16 | Even number

Hence, option C is correct.

5
 Select the one which is different from the other three responses.
» Explain it
B
Except pair (66 – 58), all other pairs’ difference is 9.

82 – 73 = 9; 

26 – 17 = 9; 

55 – 46 = 9.

But

66 – 58 = 8.

Hence, option B is correct.