(Q). In a school 20 students gave gift to each other, then find the total number of gifts.
Solution:-
2 student can be selected out of 20 students in ²⁰C₂ ways.
& in each pair gifts given are 2.
Hence total number of gifts = 2.²⁰C₂ Answer
(Q). In a school 20 students gave gift to each other, then find the total number of gifts.
Solution:-
2 student can be selected out of 20 students in ²⁰C₂ ways.
& in each pair gifts given are 2.
Hence total number of gifts = 2.²⁰C₂ Answer