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A mathematical problem of logical reasoning. (Important process)
A: Mathematics, biology.

B: Chinese, history.

C: Physics, chemistry

(According to 2 and 4, the age order of the three people is, A, C and B..

Starting from 5, A and C live together.

There are three. A teaches math.

Starting from 4, A also teaches biology and C teaches physics.

From 1, C teaches chemistry.

The last remaining language, history, is taught by b)