Question
1 if 3, A, B, 192 are consecutive term of a G.P find the value of A and B. 2 if the second and forth term of a G.P are 8 and 32 respectively find the sum of the first nine term.
Answers
oobleck
#1. once is enough, thanks. See you earlier post
#2. r^2 = 32/8 = 4
r = ±2
now you can find a, and then
S9 = a(r^9-1)/(r-1)
#2. r^2 = 32/8 = 4
r = ±2
now you can find a, and then
S9 = a(r^9-1)/(r-1)