How many words can be formed from the letters of the word ‘SERIES’,

Question:

How many words can be formed from the letters of the word ‘SERIES’, which start with S and end with S?

Solution:

To find: number of words which start and end with S

There are 4 places to fill up with 4 letters out of which 2 are of the same kind

$\Rightarrow$ Number of words $=\frac{4 !}{2 !}=12$

12 words are possible

 

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