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H0w many different codes of 4 numbers can be made from a lock with 10 numbers? The codes can contain the same numbers. For example,

H0w many different codes of 4 numbers can be made from a lock with 10 numbers?

The codes can contain the same numbers. For example, one code could be 1-2-3, while another is 2-3-2.

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Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

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