Why I m getting 16 here instead of 6?

Question

Why this comes to 16?
Var x = 1
For (var i =0; I <6 ; I++)
X+=i;
Document.write(x)

Answer 1

At first value of x is 1
Inside for loop x is added with i for every value of i upto i=5 (i<6)
i.e x=1(initial)+0+1+2+3+4+5=16
so final value of x is 16

Answer 2

<x> = 1
for...loop goes round 6 times, from 0 to 5
Iteration 1: <x> += 0 => 1
Iteration 2: <x> += 1 => 2
Iteration 3: <x> += 2 => 4
Iteration 4: <x> += 3 => 7
Iteration 5: <x> += 4 => 11
Iteration 6: <x> += 5 => 16

Answer 3

If you want to print 6 then write
x += 1 instead of
x+= i