This is why its important that we understand what geometric sequences are. A 10 the first term r 3 the common ratio n 4 we want to sum the first 4 terms. Each term is the product of the common ratio and the previous term.
Write the first five terms of a geometric sequence in which a 1 2 and r3.
The formula for finding nth term of a geometric progression is colorbluea_n a_1 cdot rn-1 where colorbluea_1 is the first term and colorbluer is the common ratio. It is denoted by r. The formula for finding nth term of a geometric progression is colorbluea_n a_1 cdot rn-1 where colorbluea_1 is the first term and colorbluer is the common ratio. Displaystyle a_ nra_ n-1 for every integer.