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Option 2 : 44

Total number of musicians = Number of musicians who play only one instrument + number of musicians who play any of the two instruments + number of musicians who can play all three instruments
120 = 40 + musicians who play violin alone + musicians who play flute alone + 30 + 6
120 = 76 + musicians who play violin alone + musicians who play flute alone
musicians who play violin alone + musicians who play flute alone = 44

Hence, 44 musicians can play either violin alone or flute alone.
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