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Option 4 : Only IV follows.
Consider the following least possible Venn diagram,
[ alt="17.07.2018.0069" src="//storage.googleapis.com/tb-img/production/18/07/17.07.2018.0069.PNG">
Conclusions:
I. All volleyballs are crickets. False
II. Some hockeys are footballs. False
III. All volleyballs are hockeys. False
IV. Some crickets being volleyballs is a possibility. True (Possibility is true as shown below)
[ alt="17.07.2018.0070" src="//storage.googleapis.com/tb-img/production/18/07/17.07.2018.0070.PNG">
Hence, only conclusion IV follows.
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