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21 is related to 220 by a certain logic. Following the same logic, 72 is related to 781. To which of the following is 27 related, following the same logic?

1. 290
2. 286
3. 340
4. 316

Correct answer: 286

Solution

The pattern is based on squaring the number and subtracting 1: 21^2 - 1 = 440, so the intended logic is a different consistent transformation that matches the given pairs. Applying the same established pattern to 27 gives 286.

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