How is the answer 6?

Question

i = 0
x=0

while i<4:
x+=i
i+=1

print(x)

# i don't understand how the answer is 6, anyone please help me.

Answer 1

1st round. x+=i, i+=1 // x = 1, i =1
2nd round. x+=i(1), i+=1 // x = 2, i =2
3rd round. x+=i(2), i+=1 // x = 3, i = 3
4th round. x+=1(3), i+=1 // x = 6, i =4

Answer 2

Because, x is increased by 1, then 2, and finally 3.

Answer 3

Its gonna take some time for me to process it. Thanks btw