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Question: Type of Products given a list

Question:Type of Products given a list

vs140580 495 Maple
listtools occurences
March 05 2023
0

Let A:=[1,2,1,6,6,2,1,1,1,4,5,2,4,5,6,7,1] say

Then I want find the

1) number of times each of the each of the element occurs
2) To multiple the number by the number of times it occurs

3) Then to multple the all these that is in the above

(3*(2)) *(3*(6))*(3*(2))*(2*(4))*(2*(5))*(1*(7))*(5*(1)) = need this value

Here we can observe 3 is the number of times 2 occurs 

3 is the number of times 6 occurs

similiary 5 is the number of times 1 occurs so on

Kind help
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