1- 4 books are arranged on a book shelf . the positions of the books are numbered 1 throgh 4 ,from the left to right . for the following pair of conditions , how many possiblr orderings are there ? c sits to the right of b . b sits next to d only if b sits next c ?(4-6-8-10-12) answer:4<<<how is that
2- A cupboard has five shelves numbered 1 through 5 , from bottom on top ...each shelf has 2 compartements. there are 8 items A,B,C,D,E,F,G,H in the cupboard , no two of which are in the same compartement .items D and Eare on the same shelf . B is on the shelf directly below G . if a shelf contain only one item , it cannot be directly above or directly below another shelf that contains only one item . C is the only item on one of the shelves . there is only one item on the fourth shelf . which one of the following is a complete and accurate list of the items any one of which could be on the top shelf ?
( D- D,E,G,C - D,E,G,B - D,E,G,C,F -D,E,G,H,F,A ) ANS: D,E,G,H,F,A
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