If ²ⁿ⁺¹ P n-1: ²ⁿ⁻¹ P n =11: 21, then n²+n+15 is equal to:

Permutations and Combinations: JEE Main 2023 Mathematics question

JEE Main 2023 · 31 Jan, Evening shift · Q45

JEE Main 202331 Jan, Evening shiftMathematicsMediumPermutations and Combinations98× since 2002

{ }^{2 n+1} \mathrm{P}_{n-1}:{ }^{2 n-1} \mathrm{P}_{n}=11: 21

, then

n^{2}+n+15

is equal to :

Your answerType your answer. Integers and decimals are accepted.

JEE Main 2023 · 31 Jan, Evening shift · Q45

JEE Main 202331 Jan, Evening shiftMathematicsMediumPermutations and Combinations98× since 2002

{ }^{2 n+1} \mathrm{P}_{n-1}:{ }^{2 n-1} \mathrm{P}_{n}=11: 21

, then

n^{2}+n+15

is equal to :

Your answerType your answer. Integers and decimals are accepted.