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: 13 – 144
Option 2: 9 – 63
Option 3: 8 – 48
Option 4: 11 – 99
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Correct Answer: 13 – 144
Solution :
Let's check the options –
First option:
13 – 144→13 × (13 – 2) = 13 × 11 = 143
≠ 144
Second option:
9 – 63→9 × (9 – 2) = 9 × 7 = 63
Third option:
8 – 48→8 × (8 – 2) = 8 × 6 = 48
Fourth option:
11 – 99→11 × (11 – 2) = 11 × 9 = 99
So, only the first option does not follow the logic of the other three options. Hence, the first option is correct.
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