Solution: We are given a multiset of 10 components: 3 identical sensors (S), 5 identical drones (D), and 2 identical robotic arms (R). The number of distinct activation sequences is the number of distinct permutations of a multiset. The total number of sequences is given by the multinomial coefficient: - jntua results
Title: Counting Distinct Activation Sequences of a Multiset Composed of Sensors, Drones, and Robotic Arms
Title: Counting Distinct Activation Sequences of a Multiset Composed of Sensors, Drones, and Robotic Arms
When designing automation systems or simulating distributed device interactions, understanding the number of unique activation sequences is crucial—especially when dealing with identical or repeated components. In this case, we are given a multiset of 10 distinct components: 3 identical sensors (S), 5 identical drones (D), and 2 identical robotic arms (R). The goal is to determine how many unique ways these components can be activated, accounting for the repetitions.
This problem falls under combinatorics, specifically the calculation of permutations of a multiset. Unlike ordinary permutations where all elements are distinct, a multiset contains repeated items, and swapping identical elements produces indistinguishable arrangements. The total number of distinct activation sequences is computed using the multinomial coefficient.
Understanding the Context
The Multiset and Its Permutations
We are working with a total of 10 components:
- 3 identical sensors (S)
- 5 identical drones (D)
- 2 identical robotic arms (R)
Since the sensors, drones, and robotic arms are identical within their categories, any permutation that differs only by swapping two identical units is not counted as a new sequence. The formula for the number of distinct permutations of a multiset is:
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Key Insights
\[
\frac{n!}{n_1! \cdot n_2! \cdot \ldots \cdot n_k!}
\]
where:
- \( n \) is the total number of items (here, \( n = 10 \)),
- \( n_1, n_2, \ldots \) are the counts of each distinct identical item.
Applying the Formula
Substituting the values from our multiset:
- \( n = 10 \)
- S appears 3 times → denominator factor: \( 3! = 6 \)
- D appears 5 times → denominator factor: \( 5! = 120 \)
- R appears 2 times → denominator factor: \( 2! = 2 \)
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Now compute:
\[
\frac{10!}{3! \cdot 5! \cdot 2!} = \frac{3,628,800}{6 \cdot 120 \cdot 2} = \frac{3,628,800}{1,440} = 2,520
\]
Final Result
There are 2,520 distinct activation sequences possible when activating the 10 components—3 identical sensors, 5 identical drones, and 2 identical robotic arms—without regard to internal order among identical units.
Why This Matters in Real-World Systems
Properly calculating permutations of repeated elements ensures accuracy in system modeling, simulation, and event scheduling. For instance, in robotic swarm coordination or sensor network deployments, each unique activation order can represent a distinct operational scenario, affecting performance, safety, or data integrity. Using combinatorial methods avoids overcounting and supports optimized resource planning.
