How Many Two-Digit Numbers Can Be Formed by Using the Numerals

question 20

Multiple Choice

How many two-digit numbers can be formed by using the numerals in the set {1,4,6,8,9} if repetition is not allowed? ​

• A) 20
• B) 118
• C) 2
• D) 22
• E) 10

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Definitions:

Psychological Problems

Issues or disorders that affect the mental health and well-being of an individual, often requiring professional diagnosis and intervention.

Depression and Anxiety

Common mental health disorders characterized by persistent sadness or worry, respectively, which can significantly interfere with daily activities.

Recycling Behavior

The actions and practices of individuals or groups regarding the sorting and disposal of waste materials to be reused or reprocessed.

Asking People

The act of requesting information directly from individuals, often used as a method of gathering data or opinions.