Permutations And Combinations Question 103
Question: On the occasion of Deepawali festival each student of a class sends greeting cards to the others. If there are 20 students in the class, then the total number of greeting cards exchanged by the students is
Options:
A) $ ^{20}C_2 $
B) $ 2\ .{{\ }^{20}}C_2 $
C) $ 2\ .{{\ }^{20}}P_2 $
D) None of these
Correct Answer: B
Show Answer
Answer:
Solution:
BETA
