Question : Directions: Four number pairs have been given, out of which three are alike in some manner and one is different. Select a different one.
(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: 21 : 182
Option 2: 11 : 92
Option 3: 17 : 146
Option 4: 31 : 284
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Correct Answer: 31 : 284
Solution :
Let's check the options –
First option:
21 : 182; (21 × 9) – 7 = 189 – 7 = 182
Second option:
11 : 92; (11 × 9) – 7 = 99 – 7 = 92
Third option:
17 : 146; (17 × 9) – 7 = 153 – 7 = 146
Fourth option:
31 : 284; (31 × 9) – 7 = 279 – 7 = 270 ≠ 284
So, only the fourth option does not follow the pattern. Hence, the fourth option is correct.
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