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### Question

There are 6 trains between two stations A and B. In how many ways can a student go from A to B and return by a different train?

**A**

30.

**B**

35.

**C**

28.

**D**

31.

**Soln.**

**Ans: a**

The upward journey is possible in 6 ways, and the downward in 5 ways. So the outcomes are 6 × 5 = 30.