Output each combination of an array of numbers with javascript

I have several numbers in an array

var numArr = [1, 3, 5, 9];

I want to cycle through that array and multiply every unique 3 number combination as follows:

1 * 3 * 5 = 
1 * 3 * 9 = 
1 * 5 * 9 = 
3 * 5 * 9 =

Then return an array of all the calculations

var ansArr = [15,27,45,135];

Anyone have an elegant solution? Thanks in advance.