testacc4trial testacc4trial
  • 19-02-2022
  • Mathematics
contestada

a lock has a three digit code. how many codes are possible. If a digit can be used only once

Respuesta :

suspho
suspho suspho
  • 19-02-2022

Answer:

below

Step-by-step explanation:

Let’s assume the first digit can be 0. Then there are 10 choices for each of the 3 digits. 10 * 10 * 10 = 1000 3-digit combinations.

      OR

Now, if the first digit cannot be 0, then we have 9*10*10 = 900 possible 3-digit combinations.

Answer Link
misspinklemonade012
misspinklemonade012 misspinklemonade012
  • 19-02-2022

Answer:

720

Step-by-step explanation:

you have 10 choices for the first digit,you have 9 choices for the second digit and 8 choices for the 3 digit .

It gives you 10×9×8=720 all in all

Answer Link

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