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Option 4 : Only conclusion II follows
The least possible Venn diagram for the given statements is as follows,
[ alt="7. RRB NTPC 16th April 2016 Shift 3 (R) images Q21" src="//storage.googleapis.com/tb-img/production/17/05/7.%20RRB%20NTPC%2016th%20April%202016%20Shift%203%20%28R%29_images_Q21.PNG">
Conclusions:
I. Some birds are peacocks → It’s possible but not definite, hence false.
II. Some peacocks are tall → It’s true as shown above in diagram.
So, only conclusion II follows.
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