2 answers

keep subtracting 8
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answered by oobleck 
7  15 =  8
 1  7 =  8
 9  (  1 ) =  9 + 1 =  8
This is an arithmetic progression with common difference d =  8
Next two term:
 9  8 =  17
 17  18 =  25 👍
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answered by Bosnian
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