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: 18 – 37
Option 2: 33 – 67
Option 3: 29 – 59
Option 4: 27 – 53
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Correct Answer: 27 – 53
Solution :
Let's check the options –
First option:
18 – 37; (18 × 2) + 1 = 36 + 1 = 37
Second option:
33 – 67; (33 × 2) + 1 = 66 + 1 = 67
Third option:
29 – 59; (29 × 2) + 1 = 58 + 1 = 59
Fourth option:
27 – 53; (27 × 2) + 1 = 54 + 1 = 55 ≠ 53
Hence, the fourth option is correct.
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