Linux isnt even suppose to be even close to Unix. Linux is based off of Minix, a micro-kernel architectureâ¦ Minix and Unix are 2 completely different cores, as different as Windows and Mac OS X, Windows and Linux, and Mac and Linux. BSD is a different beast, based on Unix, Linux is based on Minix, OS X is based on BSD.
1 A geometric sequence is one in which the same number is multiplied or divided by each element to get the next element in the sequence. 2  2, 4, 8, 16, ... is a geometric sequence.
An arithmetic series is the sum of the terms of an arithmetic sequence. A geometric series is the sum of the terms of a geometric sequence. There are other types of series, but you're unlikely to work with them much until you're in calculus. For now, you'll probably mostly work with these two. This page explains and illustrates how to work with arithmetic series.