Question : Directions: The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number pairs, except one. Find that odd number pair. (NOTE: The relation should be found without breaking down the numbers into its constituent digits.)
Option 1: 225 : 169
Option 2: 361 : 400
Option 3: 529 : 576
Option 4: 441 : 484
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Correct Answer: 225 : 169
Solution :
Let's check the options –
First option:
225: 169; (15)
2
= 225; 15 – 2 = 13; (13)
2
= 169
Second option:
361: 400; (19)
2
= 361; 19 + 1 = 20; (20)
2
= 400
Third option:
529: 576; (23)
2
= 529; 23 + 1 = 24; (24)
2
= 576
Fourth option:
441: 484; (21)
2
= 441; 21 + 1 = 22; (22)
2
= 484
So, the first option is different from the other three options as the second number should be the square of 16 instead of 13. Hence, the first option is correct.
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