A number is called a "decreasing number" if each digit in the number is less than the digit to its left. For example, 87420 is a decreasing number. How many five- digit decreasing numbers are there?

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A: Given,P(A)=38P(B)=58P(B∩A)=34

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A: *Answer:                                   

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Q: Please show work for this please and thank you :))

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