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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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
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
The correct option (B) 20P2
(C) 2 × 20C2
Explanation:
Number of ways = 20C2 × 2!
= 20P2