__,__,__,48,100,180, 294,448,648,__,__,__,.......Find the three numbers before and after given numbers in the series.

Basically if you look at the difference between each number and then the difference between the differences and keep going the third set of difference are all 6 so you can work out what the missing numbers are from that.

first three: 0, 4, 18
last three: 900, 1210, 1584

Posted by Lisa on 2005-05-09 13:31:35