Question : Directions: Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
Option 1: (7 – 56)
Option 2: (9 – 90)
Option 3: (4 – 20)
Option 4: (6 – 48)
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Correct Answer: (6 – 48)
Solution :
Let's check the given options –
First option:
(7 – 56); (7)
2
+ 7 = 49 + 7 = 56
Second option:
(9 – 90); (9)
2
+ 9 = 81 + 9 = 90
Third option:
(4 – 20); (4)
2
+ 4 = 16 + 4 = 20
Fourth option:
(6 – 48); (6)
2
+ 6 = 36 + 6 = 42
≠
48
So, the fourth option is different from the other three options as the second number should be 42 instead of 48. Hence, the fourth option is correct.
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