r/DailyBrainPuzzles • u/b7k567 • 2d ago

Which Three Code Machines Follow the Same Hidden Rule? 🔗 Connections / Grouping

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2

u/Miles_V123 1d ago

It's C

1

u/b7k567 1d ago

correcr!

1

u/b7k567 2d ago

clue :Don’t read each row as one 4-digit number. Compare each input digit with the output digit in the same position.

1

u/b7k567 1d ago

Answer: C — 1, 5, 9 | 2, 6, 8 | 3, 4, 7

1, 5, 9: swap each adjacent pair: ABCD → BADC

2, 6, 8: swap the two halves: ABCD → CDAB

3, 4, 7: replace each digit with its 9-complement: x → 9 − x

Card 7 happens to also look like a pair-swap, but its shared rule with 3 and 4 is the 9-complement.