Question: An AI startup trains a model using 6 identical blue data batches, 4 identical green data batches, and 3 identical red batches. If the batches are processed one per day over 13 days, how many distinct processing orders are possible? - AMAZONAWS
Title: How Many Unique Processing Orders Are There? Calculating Orders for Diverse AI Training Batches
Title: How Many Unique Processing Orders Are There? Calculating Orders for Diverse AI Training Batches
When training AI models, data batches must be processed systematically, but what happens when batches come in different colors—or infinitely more identical sets? One fascinating question arises: How many distinct daily processing orders exist when an AI startup trains a model using 6 identical blue data batches, 4 identical green batches, and 3 identical red batches over 13 days?
Understanding the Problem
Understanding the Context
The startup trains an AI model by processing one data batch each day for 13 consecutive days. However, the batches aren’t all unique—there are:
- 6 identical blue batches
- 4 identical green batches
- 3 identical red batches
Because the batches of the same color are indistinguishable, the challenge is calculating how many unique sequences (or permutations) can be formed using these repeated elements. This is a classic problem in combinatorics involving multinomial coefficients.
Breaking Down the Solution
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Key Insights
To find the number of distinct daily processing orders, we compute the number of permutations of 13 items where:
- 6 are identical blue
- 4 are identical green
- 3 are identical red
The formula for the number of distinct permutations of multiset permutations is:
\[
\frac{n!}{n_1! \cdot n_2! \cdot \ldots \cdot n_k!}
\]
Where:
- \( n \) = total number of items (13 batches)
- \( n_1, n_2, ..., n_k \) = counts of each distinct, identical group (6 blue, 4 green, 3 red)
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Applying the Values
Plugging in the numbers:
\[
\frac{13!}{6! \cdot 4! \cdot 3!}
\]
Now calculate step-by-step:
- \( 13! = 6,227,020,800 \)
- \( 6! = 720 \)
- \( 4! = 24 \)
- \( 3! = 6 \)
Now compute the denominator:
\[
6! \cdot 4! \cdot 3! = 720 \cdot 24 \cdot 6 = 103,680
\]
Then divide:
\[
\frac{6,227,020,800}{103,680} = 60,060
\]
