1.

On the occasion of Dipawali festival ,each student of a class sends greeting cards to others.If there are 20 students in the class, the numbers of cards send by student is

Answer»

`""^(20)C_(2)`
`""^(20)P_(2)`
`2XX""^(20)C_(2)`
`2xx""^(20)P_(2)`

Answer :B::C


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