If ²ⁿ⁺¹Pₙ₋₁: ²ⁿ⁻¹Pₙ = 11: 21, then n² + n + 15 is equal to: | JEE Main 2023 Mathematics PYQ | Jeeify

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NVAMediumJEE Main 2023 · 31 January, Shift 2Permutations (P(n,r))

If $^{2n+1}P_{n-1} : \; ^{2n-1}P_{n} = 11 : 21$ , then $n^2 + n + 15$ is equal to:

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