Question #254f6
2 Answers
Oct 7, 2017
Explanation:
"the "color(blue)"sum to n terms" for a geometric series is.
•color(white)(x)S_n=(a(r^n-1))/(r-1)
"where a is the first term and r the "color(blue)"common ratio"
r=(a_2)/(a_1)=(-6)/2=-3
rArrS_7=(2((-3)^7-1))/(-4)
color(white)(rArrS_7)=(2xx-2188)/(-4)=1094
Oct 7, 2017
Answer is
Explanation:
Given the geometric series is:
Let,
So, common multiplier
Now, Let a term of the sequence be
So,
Now, Let sum of the series up to
So, sum upto
Hope it Helps!!