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  4. Let S be the set of all 5 -digit number that can be formed from the set 1,2,3,4,5,6,7,8,9 by selecting digit from the set without replacement. If N is the subset of S containing of all those elements of S for which it is true that the digit 2,4 and 6 appear, and are in the proper order, for example 12346 is an element of N, as 75246 , and not 64257 then number of elements does N contain, is

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Q. Let $S$ be the set of all 5 -digit number that can be formed from the set $\{1,2,3,4,5,6,7,8,9\}$ by selecting digit from the set without replacement. If $N$ is the subset of $S$ containing of all those elements of S for which it is true that the digit 2,4 and 6 appear, and are in the proper order, for example 12346 is an element of N, as 75246 , and not 64257 then number of elements does N contain, is

Permutations and Combinations

Solution:

Correct answer is (a) 300

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