Guess the missing number from the given responses,

173 (24) 526

431 (18) 325

253 ( ? ) 471

The number in the bracket is the sum of the individual numbers on the two sides of the bracket.

1 + 7 +3 + 5 + 2 + 6 = 24

So,

2 + 5 + 3 + 4 + 7 + 1 = 22

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