(Q8767)
Statements
Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle C_{k,n}={\frac {k}{2}}n(n-1)+1=5n^2-5n+1}
0 references