There are six chairs in a classroom. In how many ways 3 students can sit on them
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How is coal formed? Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over million of year.
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Step-by-step explanation:
Another way of looking at it is to seat the 3 people first.
Suppose A, B and C are the 3 people, there are 6 ways of organise them.
Namely: ABC,ACB, BAC, BCA, CAB, CBA.
The 4th seat is empty and it can be in any of the space shown below:
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