Question 369153
The correct one is  (Ο/Δ)+(Ω/Ο)=(ΟΟ+ΩΔ)/(ΔΟ).
Suppose (a) is correct:  Then {{{1 = 1/2 + 1/2 = 3/2 = 1.5}}}, contradiction.
Suppose (b) is correct:  Then {{{1 = 2/3 + 1/3 = 4/5 = 0.8}}}, contradiction