Select the correct answer. Walter is researching the influence of World War II on literature during the time period. His teacher told him he should consider using primary
sources. Which one of these would be appropriate?
OA
a documentary on popular historical fiction writers
OB.
an interview with various publishers
O C.
a literature textbook
OD.
a book written during the time period

D

Explanation:

It would be a primary source because it came from the time period. A textbook is a good source, however it would still be considered a secondary source.

Step-by-step explanation:

Given

Peter hits

Mary hits

Required

The probability that Mary wins

From the question, we understand that Peter throws the first.

If Mary is to win, then Peter has to lose his throw

Using the complement rule, the probability that Peter misses is:

So, the probability that Mary wins is:

This gives: