Mathematics · 2022
JEE Main · 26 July 2022, Shift 2 · Q4
Σ_i, j=0 i ≠ j^n^n C_i^n C_j is equal to
$\displaystyle \sum_{\substack{i, j=0 \\ i \neq j}}^n{ }^n C_i{ }^n C_j$ is equal to
Official answer
(1)
$\displaystyle 2^{2 n}-{ }^{2 n} C_n$
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JEE Main 2022 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.