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On the occasion of Dipawali festival each student of a class sends greeting cards to others.

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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 send by students is 

(A) 20C2 

(B) 20P2 

(C) 2 × 20C2 

(D) 2 × 20P2

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1 Answer

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Best answer

The correct option (B) 20P2 

(C) 2 × 20C2   

Explanation:

Number of ways = 20C2 × 2! 

= 20P2

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