Most loops start with i=0, so i=3 will be harder to compress, increasing script size and slowing down and git pushes.

think about all cases: 2 odds, 2 even and 1 odd& 1even, you will find all cases lead to same result: even number.

Mine too!!! For pretty much everything!

I'm not English myself, so I understand the language problems, but I am not sure what you are asking, so please ask me again if I am answering the wrong question.

The kata wants the result rounded (look at the last sentence of the description), so I need to use Math.round(). Javadoc is found here: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#round-double-

Note that if I pass in a double, it returns a long. That's why I need to add the (int) cast on the last line.

Casting it to an int just throws away the decimal part, while Math.round() will round it to the nearest integer:

 (int) 3.8 == 3
 Math.round(3.8) == 4

Does that answer your question?