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Select the odd pair of numbers from the given options.
1. 81 : 729
2. 25 : 125
3. 64 : 256
4. 49 : 343

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Correct Answer - Option 3 : 64 : 256

The logic followed is:

Option 1: 81 : 729

(9)2 : (9)3

81 : 729

Option 2: 25 : 125

(5)2 : (5)3

25 : 125

Option 3: 64 : 256

(8)2 : (8)3

64 : 512 ≠ 256

Option 4: 49 : 343

(7)2 : (7)3

49 : 343

Hence, the correct answer is "Option 3".

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