Why the answer is 6? Python Beginners

Question

27.1 exercise 4/5
I=0
X=0
While I < 4:
X+= I
I+=1
Print(x)

Answer 1

You can check quiz comments to understand the quiz clearly.
For example, I got this from the top comment.

x =0 , i =0
while i<4
x+ = i , i+ = 1
1st loop
x = 0 + 0 = 0
i = 0 + 1 = 1
2nd loop
x = 0 + 1 = 1
i = 1 + 1 = 2
3rd loop
x = 1 + 2 = 3
i = 2 + 1 = 3
4th loop
x = 3 + 3 = 6
i = 3 + 1 = 4( i not less than 4 and program stop here )
So, the value of x is 6.

Answer 2

because in the loop x get sum of each values of l: 0 + 1 + 2 + 3 == 6

Answer 3

x += l is same as x = x + l

Answer 4

Thanks visph!

Answer 5

Ohhhhhhh

Answer 6

Thanks Simba

Answer 7

If you want some other value in the X variable you can replace the l with some other value