multiplication of combinaton values?

2023 9 13
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I would like to compute multiplcation of combination of numbers. For example if I have;
1, 2, 3, 4, 5 and want to find
Triple combinations of these numbers are
1,2, 3; 1,2,4; 1,2,5; 1,3,4; 1,3,5; ... etc How can find a=1*2*3; b=1*2*4; c=1*2*5; d=1*3*4; e=1*3*5 etc
a. How can I find all the multiplications of triple combinations, that is, a, b, c, d, etc
b. How can I easily and quickly find sum of a,b,c,d etc?

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Dyuman Joshi
Dyuman Joshi 2023-9-13
编辑：Dyuman Joshi 2023-9-13

0 个投票

You are looking for
a - nchoosek
b1 - prod and b2 - sum

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metin yilmaz
metin yilmaz 2023-9-13
I can use easily nchoosek but I don't know how to assign each result to a variable
Dyuman Joshi
Dyuman Joshi 2023-9-13
Ran in:
Ran in:
@metin yilmaz
arr = nchoosek(1:5,3)
arr = 10×3
1 2 3 1 2 4 1 2 5 1 3 4 1 3 5 1 4 5 2 3 4 2 3 5 2 4 5 3 4 5
p = prod(arr,2)
p = 10×1
6 8 10 12 15 20 24 30 40 60
s = sum(p)
s = 225

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