10, 50, 13, 45, 18, 38, ?, ?
What two numbers should replace the question marks?

25, 27.

There are two alternate sequences: start at 10 and add 3, 5, 7; start at 50 and deduct 5, 7, 9.

10, 50, 13, 45, 18, 38, ?, ? 
What two numbers should replace the question marks?

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