Use the Combinations Formula
Use the Formula For $$\mathrm { n } ^ { \mathrm { C } _ { \mathrm { r } } }$$

question 55

Multiple Choice

Use the Combinations Formula
Use the formula for
$$\mathrm { n } ^ { \mathrm { C } _ { \mathrm { r } } }$$ to evaluate the expression.
-Ron finds 9 books at a bookstore that he would like to buy, but he can afford only 5 of them. In how many ways can he make his selection? How many ways can he make his selection if he decides that one of the
Books is a must?

• A)126; 70
• B)15,120; 1680
• C)3024; 1680
• D)7560; 840 5 Additional Concepts
• Evaluate the expression.

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Definitions:

Romantic Couple

Two individuals involved in a romantic relationship, characterized by emotional and physical intimacy.

Intimacy

A close, familiar, and affectionate personal relationship with another person that involves a deep level of emotional connection.

Social Connection

Describes the relationships people have with others and the resulting sense of belonging and support obtained through these interactions.

Homeostasis

A state of balance in the body's internal environment, despite external changes.