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Option 3 : 30
The number of traveller who like to travel either by train or plane but NOT by bus is represented by the region covered by triangle and rectangle which is not a circle, as shown below:
[ alt="F1 Archana.M 02-04-2020 Savita D5" src="//storage.googleapis.com/tb-img/production/20/05/F1_Archana.M_02-04-2020_Savita_D5.png" style="width: 372px; height: 240px;">
So, number of people = (11 + 6 + 13) = 30
Hence, ‘30’ is the correct answer.
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