Tag: sequences

A geometric sequence is formed by multiplying each term after the 1st term by a constant, to determine the next term. The constant is the common ratio, r , of any term after the first, to the preceding term. My geometric sequence is 4, 12, 36, 108, 324,…… Part 1 : Find and . Know- =4…

My arithmetic sequence is 12,15,18,21,24…… Part 1-How to find and general equation for ? Solution: Know-=12 d=15-12 d=3 = +（n-1）d =12+(n-1)3 =12+3n-3 =9+3n   =9+3(50) =9+150 =159 Part 2-How to determine the sum of these first 50 terms? Solution: