A1=8,r=3 what is the sum of the first 12 terms?

1 Answer
Jim G.
Apr 27, 2018

#S_(12)=2125760#

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#

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