My Arithmetic Sequence: How to find: =+(n-1)(d) =12+(50-1)(6) =12+(49)(6) =12+294 =306     How to find: =+(n-1)(d) =12+(n-1)(6) =12+6n-6 =6+6n     How to find: =(+) =(12+306) =25(318) =7950