Need help in CS Academy Question : "And Closure"

Revision en2, by IDoNotKnowAnything, 2017-04-19 18:30:33

Can someone help me in solving this question here.I had tried to solve it for hours but could not solve it.Later I watched the editorial but I am unable to get it.I understood the basic idea of role of bit being set 0 .But Still I am unable how this fact is incorporated in the solution . Can someone please help me with the problem ???? Thanks in advance and have a good day :)

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en2 English IDoNotKnowAnything 2017-04-19 18:30:33 13
en1 English IDoNotKnowAnything 2017-04-19 18:29:47 477 Initial revision (published)