I'm trying to figure out what the summation notation of

[stevenham]

I'm trying to figure out what the summation notation of

(1-x1)^θ * (1-x2)^θ * ...(1-xn)^θ would be for summation

I know I need to convert this to a summation notation in order to solve my problem, but I can't figure out how to convert it. Any help will be appreciated.

 

[Mark44]

I'm trying to figure out what the summation notation of

(1-x1)^θ * (1-x2)^θ * ...(1-xn)^θ would be for summation

I know I need to convert this to a summation notation in order to solve my problem, but I can't figure out how to convert it. Any help will be appreciated.

As you have written this, it's not a sum - it's a product. In a summation, the terms are added. In a product, the factors are multiplied.

For example, you can write 1²*2²*3²*...*n² as a product like this:
$$\prod_{k=1}^n n^2$$