A secure entrance at a warehouse uses a six-digit combination. The combination must be made up of digits ranging from 2 to 8, inclusive, with no digit repeated, and both the first and last digits must be even. How many different combinations can be formed?

Correct answer marked below

120

240

360

720

1440

Correct

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Official Explanation

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Total combinations=4 (first digit)×3 (last…

Comments

RahulOct 18, 2024

Love how you solved this

ArinJun 12, 2024

thanks

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.