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Mathematics · 2020
JEE Main · 7 January 2020, Shift 1 · Q55
Total number of 6-digit numbers in which only and all the five digits 1, 3, 5, 7 and 9 appear, is:
Total number of $\displaystyle 6$-digit numbers in which only and all the five digits $\displaystyle 1$, $\displaystyle 3$, $\displaystyle 5$, $\displaystyle 7$ and $\displaystyle 9$ appear, is :
Official answer
(4)
$\displaystyle \frac{5}{2}(6!)$
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JEE Main 2020 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.