For maximum discharge, ratio of the pressure at the exit and at inlet of the nozzle (P2/P1) is equal to -
1
\([\frac{2}{n+1}]^{\frac{n}{n+1}}\)
2
\([\frac{2}{n+1}]^{\frac{n-1}{n}}\)
3
\([\frac{2}{n+1}]^{\frac{n}{n-1}}\)
4
\([\frac{2}{n+1}]^{\frac{n+1}{n}}\)