Posted by **shakira.shakira** on Sunday, February 27, 2011 at 6:48am.

Insert 3 numbers between15 to 17 such that the terms from an Arithmetic progression

- math -
**Reiny**, Sunday, February 27, 2011 at 8:29am
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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