A company is assigning 4-character identification codes to its staff members. The codes will consist solely of the letters B, D, G, J, M, R, and T. If each letter in a code must be unique, how many different codes can be created?

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840

Correct

1680

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Official Explanation

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Solution Given: • A company is assigning 4-character identification codes to its staff members • The codes will consist solely of the letters B, D, G, J, M, R, and T • Each letter in a code must be unique To find: • The number of different codes Approach and Working: We can represent…

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Comments

AshleyJan 14, 2025

This is exactly what I needed to practice

subhamDec 23, 2024

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What this question tests

What it tests

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

Common trap

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