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Kind of confused with this whole probability concept, i just need help with these here

Kind of confused with this whole probability concept, i just need help with these-example-1
User Celeste
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1 Answer

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Solution

For this case we have 0-9 possible digits (10) and 4 spaces for the code

Part a

The number of ways are using the multiplication principle:

10x9x8x7= 5040

Part b

p= 1/5040

Part c

If digits can be repeated we have this:

10x10x10x10= 10000

User Svetlana Levinsohn
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