A manager is tasked with selecting a five-digit security code for the office entrance. The first and last digits of the code must be odd, and each digit must be unique. How many distinct security codes can be created?

Correct answer marked below

A

3620

B

4220

C

4820

D

5420

6720

Correct

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S

SampadaFeb 13, 2024

Amazing

I

IbrahimDec 22, 2024

Can someone explain it other way?

What this question tests

Whether you can count arrangements and selections correctly — permutations vs. combinations.

Overcounting: treating a selection as ordered when order does not matter, or forgetting to divide by duplicates.

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