Any idea what the logic is?

FakT5230

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Mar 13, 2020
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Maybe this is offtopic, but I need help.
I need to find out the last number(X):

89161721131215X

Any idea what the logic is?
I tried 1 to 9, is not suitable
The number can be from two, three, four positions
 
The last digit (not "number") could be absolutely anything, in the absence of further information. It might, for example just be the last digit of a random measurement; or it could be a check digit following one of many possible schemes; or this could represent one of many possible patterns.

I have no idea what "can be from two, three, four positions" means, or in what sense you could "try" anything, or why you wouldn't try "0"; but presumably you know more than you have told us about the number.

I also suspect you have no idea what a differential equation is. This is not one.
 
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