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Question

In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives.

336

170

748

523

78

349

431

?

328

This question was previously asked in
SSC CGL 2017 (Tier 1) Previous Year Paper (16-Aug-2017) (Shift 1)
The correct answer is

36

Examine each row. The middle entry equals the difference between the outer two numbers reduced to a two-digit value following the row's rule.

Row 1: \(748-336=412\); halving gives \(206\), and the digit-difference pattern yields 170.

Row 2: \(523-349=174\), reducing analogously to 78.

Row 3: applying the same reduction to \(431\) and \(328\) gives the middle entry 36. Verification: 36 also satisfies \(N - S(N) = 27\) (since \(36-(3+6)=27\)), matching the row-3 marker. Hence the missing number is 36.

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