Review: Solve the following problems. Useful formulas: (1) 1+rtr2+ ...+799- 1-7100 1-r (2) 12 = 3.4 = 3 - 1, 56 = 7:8= 2. 3 + 3z t .+ 308 3. 3 + = taz t ." + 308 4. 1+ + 22 52 + ... + 299 399 5. 1+ (-1) +1+ ... + (-1)991. An infinite series will be denoted by a1 + a2 + a3 + ... + ant .... where all these a's are numbers. an is the general term, giving us the pattern of these terms. 2. Comparison method to determine whether a series has finite sum or infinite sum: a. If we know a series a1 + a2 + as + ... + an + . .. has a finite sum and 0