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Bunuel
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let x be total

according to question. 75% (0.75x) have opted for only one of the 2, so 25% (0.25x) of students have opted for both

(120 - 0.25x) + 0.4x = 0.75x
This gives x = 200

Now, those who've opted for both = 0.25*200 = 50

So option D
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