Jee Main
Permutations And Combinations
JEE Main 2023 (Online) 31st January Evening Shift
INTEGER+4 / -12023
If ${ }^{2 n+1} \mathrm{P}_{n-1}:{ }^{2 n-1} \mathrm{P}_{n}=11: 21$,
then $n^{2}+n+15$ is equal to :
then $n^{2}+n+15$ is equal to :
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