Mathematical reasoning in primary schools - Training Enrollment Network

Mathematical reasoning in primary schools

A is a criminal.

If A is telling the truth, then B should be a lie, B is a lie, and D should be true. So a can't be the truth.

If B is telling the truth, then A is not a criminal, he is telling the truth. So b is not the truth.

If C is telling the truth, then A is not a criminal, he is telling the truth. So c didn't tell the truth.

Only Ding told the truth, and A, B and C all lied, so Ding and B were not criminals, and A lied to cover up the facts of the crime.

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