A1=8,r=3 what is the sum of the first 12 terms?
1 Answer
Apr 27, 2018
Explanation:
#"for an "color(blue)"geometric sequence"#
#"the sum to n terms is"#
#•color(white)(x)S_n=(a(r^n-1))/(r-1)#
#"where a is the first term and r the common ratio"#
#"here "a=8,r=3" and "n=12#
#rArrS_(12)=(8(3^(12)-1))/(3-1)#
#color(white)(xxxxx)=(8xx531440)/2=2125760#