Help needed :)

Question

I would really appreciate it if you guys help me out with this:

1. Write a function that would return [4,3,8,6,16,12...192]

2. Write a function that would return 3 elements from an array that sum up to 0
Ex:
Input = [6,-3,9,-2,-3,7,8...]
Output = [6,-3,-3]

3. Assume A and B are two lines parallel to the x axis, write a function that would return the length of line C which is a line where A and B overlap
Ex:
A = (2,8)
B = (4,10)
Length of C = 4

Please write your answers in javascript or python.
I have written mine but I would like to see a cleaner, more efficient way of writing them

Here's mine
https://code.sololearn.com/WWhi5l9k5Vmp/?ref=app

Answer 1

You first function contains a useless if/else logic, this works also:
Series=function(){
a=4;
b=3;
c=[];
while(b<2*192){
c.push(a);
a*=2
c.push(b);
b*=2
}
return c
}

Answer 2

Paul Jacobs thank you for noticing that redundancy