2nd class combinations

From how many elements you can create 4560 combinations of the second class?

Correct answer:

n =  96

Step-by-step explanation:

(2n)=2n(n1)=4560;n>0 n2n9120=0  a=1;b=1;c=9120 D=b24ac=1241(9120)=36481 D>0  n1,2=2ab±D=21±36481 n1,2=21±191 n1,2=0.5±95.5 n1=96 n2=95   Factored form of the equation:  (n96)(n+95)=0   n>0n=96

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