Question 1027551
1) {{{P(A)=3/5}}}
{{{P(B)=2/4=1/2}}}
{{{P(C)=1/3}}}
{{{P(D)=1}}} Since there are no artificial oranges left.
{{{P= (3/5)(1/2)(1/3) =1/10}}}
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2) Treat the biology books as one unit so then there are 9 books to choose from.
{{{N=9!}}}
However within the four biology books unit, the biology books can be arranged in {{{4!}}} different ways so,
{{{N=9!4!=8709120}}}