2nd class combinations

From how many elements can you create 2346 combinations of the second class?

Correct answer:

n =  69

Step-by-step explanation:

(2n) = 2346   2! (n2)!n! = 2346   2! (n2)!n(n1)(n2)! = 2346   2n(n1) = 2346  n (n1)=2 2346  n (n1)=2 2346 n2n4692=0  a=1;b=1;c=4692 D=b24ac=1241(4692)=18769 D>0  n1,2=2ab±D=21±18769 n1,2=21±137 n1,2=0.5±68.5 n1=69 n2=68  n>0  n=n1=69

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