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Option 4 : Only 1,4 and 2 or 3 are rational

The least possible venn diagram is:

[ alt="F1 Shailesh.Y 16-06-2020 Savita D19" src="//storage.googleapis.com/tb-img/production/20/06/F1_Shailesh.Y_16-06-2020_Savita_D19.png" style="width: 178px; height: 124px;">

1. Some disciples are students. → True

2. Some captains are children. → False

3. No captain is a child. → False

4. Some students are children. → True

But 2 and 3 forms a complementary pair.

Hence, only 1, 4 and 2 or 3 are rational.
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