Permute it!
Probability
Level
2
The number of permutations of the set in which no two adjacent positions are filled by consecutive integers (increasing order) is :
13
11
17
19
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1 solution
No. Of permutations using Principle of Inclusion & Exclusion is:
4 ! − 3 × 3 ! + 3 × 2 ! − 1 ! = 1 1