Multiplying vector members without repeating

Hi I need to multiply values from one vector in all combinations. For example Lets say that vector A=[1 2 3 4]' I need to get these products 1*2 1*3 1*4 2*3 2*4 3*4

Thanks for help

Answer 1

[Stephen Cobeldick]

>> A = 1:4;
>> prod(nchoosek(A,2),2)
ans =
    2
    3
    4
    6
    8
   12

[giometar]

So simple :-) Thank you very much