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Option 1 : Only conclusion I follows
Consider the following least possible Venn diagram,
[ alt="SSC CHSL 26 March 2018 Shift2 Bhagwant Umang Pratap Singh hrev images Q18" src="//storage.googleapis.com/tb-img/production/18/09/SSC_CHSL_26_March_2018_Shift2_Bhagwant_Umang%20Pratap%20Singh_hrev_images_Q18.PNG">
Conclusions:
I. No fire are matchboxes → True (It is definitely true as no fire can be matchboxes).
II. All matchboxes are fire → False (It is definitely false because it is not possible).
Hence, only conclusion I follows.
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