Question

On the occasion of Diwali 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
(a) ²⁰C₂ (b) 2.²⁰C₂
(c) 2 x ²⁰P₂ (d) none of these

Answer 1

Answer:

___your answer is -

73+₹-%+₹++₹+₹+'-;":"((₹&#%3--₹+%(3(₹+

Answer 2

Step-by-step explanation:

total numbers of students are 20

then greetings card send by students are 19

so 20x19 gives 380 and it's equal to 20p2 and correct option is B