Consider that arc AXB is the minor arc and arc AYB is the corresponding major arc.
It is known that, the measure of major arc = 360∘ − the measure of the corresponding minor arc.
We have, m(arc AXB) = 120°.
So, m(arc AYB) = 360∘ − m(arc AXB) = 360∘ − 120∘ = 240∘
Hence, the correct answer is option 240°.
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