In a book shelf there are 24 books arranged in a stack having Mathematics,Physics,Chemistry and Economics books . Every Mathematics book has a Chemistry book next to it , every Physics book has an Economic book next to it and there is no physics book next to Mathematics book . If there is a Mathematics book at the top then what is the order of books ?
Mathematics,Chemistry,Physics and Economics.
Mathematics,Chemistry,Economics and Physics.
Mathematics,Physics,Chemistry and Economics.
Mathematics,Physics,Economics and Chemistry .
Clearly the sequence is : Mathematics,Chemistry,Physics and Economics .
both a and b option can be correct
why only a
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