I need help with some python code. And someone please explain to me how the output is 13 [solved]

Question

x=[6, 4, 2, 9]
x=x[::-1]
print(x[0]+x[2])

Answer 1

The second line reverses the list thus x becomes [9,2,4,6]
The value of x[0] is 9 while x[2] is 4 so their sum is 13

Answer 2

::-1 basically reverses the list, so to see the indexes, count backwards. 9+4=13, so that's how you get the output.

Answer 3

x=[6, 4, 2, 9]
x=x[::-1]
#now x is reversed -> x=[9, 2, 4, 6]
print(x[0]+x[2])
#first index + third index
#9 + 4
#= 13

Answer 4

ans is
13