Answer:
B) Outcomes in A = {3, 4, 5} .
C) Outcomes in B = {5, 15, 25, 125, 215} .
D) Outcomes in C = {3, 4, 5, 23, 24, 25} .
Step-by-step explanation:
We are given that a college library has five copies of a certain text on reserve. From which two copies (1 and 2) are of first printings, and the other three (3, 4, and 5) are of second printings.
Also, it is stated that a student will stop examining the books only when a second printing has been selected.
A) The outcomes in S are :
<u> Number of outcomes</u> <u>Selection of Outcomes</u>
1 3
2 4
3 5
4 13
5 14
6 15
7 23
8 24
9 25
10 123
11 124
12 125
13 213
14 214
15 215
Here outcome 123 means 1st copy of first printing is examined then 2nd copy of first printing is examined and then 3rd copy of second printing is examined and then the student stops.
B) <em>A denote the event that exactly one book must be examined.</em>
So, the outcomes in A will be outcome number 1, 2 and 3 corresponding to selection 3, 4 and 5 of second printing because in these outcomes only one book is examined.
Hence, outcomes in A = {3, 4, 5} .
C) <em>B be the event that book 5 is the one selected</em>. It means all those outcomes in which book 5 was last examined. So, the outcomes in B will be outcome number 3, 6, 9, 12, 15 corresponding to selection 5, 15, 25, 125, 215
Hence, outcomes in B = {5, 15, 25, 125, 215} .
D) <em>C be the event that book 1 is not examined</em> which is outcome number 1, 2, 3, 7, 8, 9 corresponding to selection 3, 4, 5, 23, 24, 25 .
Hence, outcomes in C = {3, 4, 5, 23, 24, 25} .
=
=
=
=
= 3.5. So
= 21.
