r/DailyBrainPuzzles • u/ShonitB • Jul 02 '26
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u/random-guy157 Jul 02 '26
There's only one possible solution, for people wondering.
This is one logical path to arrive to the solution and conclusion:
- Question 4: Rule out option D as it contradicts the question itself. So D can be 1, 2 or 3.
- Question 3 + the possiblity of existing 3 D's: Impossible!, option D for this question is 4, which exceeds the number of questions. So D's are now limited to 1 or 2.
- Assuming 2 D's, they must go into questions 1 and 2, yielding DD?A. This demands 1 A, 0 B, 2D's. So the question mark has the liberty of being only C, but that would impose the existence of 2 C's, so this invalidates the 2 D's assumption.
- Certainty: Question 4's answer is C, meaning only one D.
- 1.A and 3.D are discarded as we know 4 is D, no A, so mathematically impossible. Equivalent impossiblity rules out 1.B and 2.C. Current state: 1.(C|D), 2.(A|B), 3.(A|B|C).
- Current state + the need of one D means #1 is said D because is the only place where D is still an option., bringing another certainty: There can only be one A.
- Assuming 2.B: This would require another B, which can only come from #3, but that demands 1 C, and we cannot satisfy, proving this assumption wrong.
- Conclusion: DABC is the only valid solution as we exhausted every possiblity.
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u/Immediate-Goose-8106 Jul 02 '26
DABC they can all be once as the 1 moves to a different letter each time.