Discussion of Question with ID = 030 under Permutations-and-Combinations

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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.


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