Manny needs to create a four-digit password for his cellphone. If no digits can be repeated, in how many ways can this task be done?a.5,040b.10,000c.210d.7,180

Question

Manny needs to create a four-digit password for his cellphone. If no digits can be repeated, in how many ways can this task be done?a.5,040b.10,000c.210d.7,180
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Solution 1

To solve this problem, we need to use the concept of permutations.

Step 1: Manny has 10 choices (0-9) for the first digit of his password.

Step 2: For the second digit, since no digit can be repeated, he only has 9 choices left.

Step 3: For the third digit, he has 8 choices left.

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Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study problem.
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