From Ranpur to Devgarh there are 4 buses and 3 trains…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
From Ranpur to Devgarh there are buses and trains. From Devgarh to Sonpur there are ferries and taxis. In how many ways can Lalit travel from Ranpur to Sonpur through Devgarh?
Need a reminder? The key ideaShow
If a task can be done in ways or in other ways, with no way in both, it can be done in ways. Stages one after another multiply; separate cases add. Fill a place that has a rule first.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. First leg. A bus or a train: ways.
Step 2. Second leg. A ferry or a taxi: ways.
Step 3. Both legs. ways.
Answer: ways.
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