What is the sum of the geometric sequence 8, –16, 32 … if there are 15 terms?
Answers
Answered by
0
Answer:
87384
Step-by-step explanation:
a=2,r=-2,n=15
Sn=a*(r^n-1)/r-1
=8*[(-2)^15-1]/[-2-1]
=-8/3*(-32768-1)
=-8/3(-32769)
=262152/3
=87384
Similar questions