multiplication of combinaton values?

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?

Answer 1

[Dyuman Joshi]

You are looking for

a - nchoosek

b1 - prod and b2 - sum

[metin yilmaz]

I can use easily nchoosek but I don't know how to assign each result to a variable

[Dyuman Joshi]

@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