what is the common difference of this artihmetic sequence, 1/2, 1/3, 1/6,0?

Answer 1

Looks like 1/6 to me. The terms re-written are 3/6 , 2/6, 1/6, 0/6

Always look for a common bottom number.

Each number is 1/6 less than the previous number.

Answer 2

1/2 - 1/6 = 1/3
1/3 - 1/6 = 1/6
1/6 - 1/6 = 0

so 1/6 is the difference.

Answer 3

The difference would be 1/6:
1/2-1/6
3/6-1/6=2/6=1/3

1/3-1/6
2/6-1/6=1/6

1/6-1/6=0

I hope this helps!