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A three-digit even number is given such that the hundreds, tens, and unit digits respectively form a decreasing arithmetic sequence. When two is added to the number, the same order of the digits now forms a geometric sequence. What is the original number?

 Jan 5, 2021
 #1
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+1

840
8-4=4

4-4=0

 

840+2=842

8/4=2

4/2=2

 Jan 5, 2021

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