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On the occasion of Dipawali festival eac...

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 number of cards sends by students is

A

`""^(20)C_(2)`

B

`""^(20)P_(2)`

C

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

D

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

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2018-MULTIPLE CHOICE QUESTIONS
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  19. If the equation x^(2)-cx + d= 0 has roots equal to the fourth powers o...

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  20. On the occasion of Dipawali festival each student of a class sends gre...

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