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Q:

The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number-pairs EXCEPT one. Find that odd number-pair.

  • 1
    4 : 48
  • 2
    6 : 180
  • 3
    8 : 448
  • 4
    9 : 639
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Answer : 4. "9 : 639"

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