Posted by shakira.shakira on Sunday, February 27, 2011 at 6:48am.
let the sequence be
15 , 15+d, 15+2d, 15+3d, and 17
then 17 - (15+3d) = d
17 - 15 - 3d = d
-4d = -2
d = 1/2 or .5
the inserted numbers are 15.5, 16, and 16.5
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