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Find the number of 5 letter words that c...

Find the number of 5 letter words that can be formed using the letters of the word CONSIDER. How many of them begin with ''C'', how many of them end with 'R' and how many of them begin with ''C'' and end with ''R'' ?

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The correct Answer is:
`=1xx1xx""^(6)P_(3)=6xx5xx4=120`
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