Answer :
You skiped one operator.
I assume that the function is f(n+1) = f(n) - 2.
f(1) = 10
f(2) = f(1) - 2 = 10 - 2 = 8
f(3) = f(2) - 2 = 8 - 2 = 6
f(4) = f(3) - 2 = 6 - 2 = 4
f(5) = f(4) - 2 = 4 -2 = 2
So the sequence, is 10, 8, 6, 4, 2, ... [option d]
I assume that the function is f(n+1) = f(n) - 2.
f(1) = 10
f(2) = f(1) - 2 = 10 - 2 = 8
f(3) = f(2) - 2 = 8 - 2 = 6
f(4) = f(3) - 2 = 6 - 2 = 4
f(5) = f(4) - 2 = 4 -2 = 2
So the sequence, is 10, 8, 6, 4, 2, ... [option d]