Question : Directions: Select the odd group of numbers.
(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 – 159
Option 2: 9 – 71
Option 3: 5 – 31
Option 4: 17 – 279
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Correct Answer: 5 – 31
Solution :
Let's check the options –
First option:
13 – 159→(13)
2
= 169; 169 – 10 = 159
Second option:
9 – 71→(9)
2
= 81; 81 – 10 = 71
Third option:
5 – 31→(5)
2
= 25; 25 – 10 = 15 ≠ 31
Fourth option:
17 – 279→(17)
2
= 289; 289 – 10 = 279
Hence, the third option is correct.
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