c# - How to select values within a provided index range from a List using LINQ -

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I am trying to use it to get the following:

I have a List is Ints: -

list & lt; Int & gt; IntList = new list & lt; Int & gt; (New int [] {1,2,3,3,2,1});

Now, I want to compare the amount of first three elements [index range 0-2] using the LINQ from the last three [index 3-5]. I tried and select LINQ and bring the SelectMany method along with extension methods, but I can not understand that 

  to say something like (from p in intList where Select Elements from p to intList from p Select the index x to x + n p) .sum ()

I see that the extension is also an extension, but I do not have to see it That's what I want. Any suggestions? Thank you. Use

then use. 

  yourEnumerable.Skip (4). (3). (X = & gt; x) (intList.Skip (x)) Select P from (P) Select P) .sum ()

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