Let S be the of 6- digit numbers a-1a-2a-3a-4a-5a-6 -all digits distinct- where a-1 - a-2 - a-3 - a-4 - a-5 - a-6- Then n-S- is equal to21021004200420

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Toppr Admin · Accepted Answer

Let S be the set of 6- digit numbers a1a2a3a4a5a6 (all digits distinct) where a1>a2>a3>a4<a5<a6. Then n(S) is equal to21021004200420

Let $S$ be the set of $6$ - digit numbers $a_{1} a_{2} a_{3} a_{4} a_{5} a_{6}$ (all digits distinct) where $a_{1} > a_{2} > a_{3} > a_{4} < a_{5} < a_{6}$ . Then $n (S)$ is equal to
$210$
$2100$
$4200$
$420$