DSSSB · Reasoning

In the following number-pairs, the second number is obtained by applying a certain rule to the first number. What values ​​will come in place of X and Y in X : 64 :: 15 : Y?

  1. X = 10, Y = 279
  2. X = 7, Y = 256
  3. X = 8, Y = 256
  4. X = 9, Y = 225
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