DIVIDING the first number by second number and putting a negative (minus) sign to the answer.Let A and B are two numbers such that A Ω B thenA Ω B = -(A ÷ B) i.e.30 Ω 6 = -(30 ÷ 6) = -580 Ω 2 = -(80 ÷ 2) = -4020 Ω 4 = -(20 ÷ 4) = -5Similarly, 70 Ω 2 = -(70 ÷ 2) = -35.Hence, -35 is the correct ALTERNATIVE.