Honestly I’m not for sure but I’m think it’s either a or b
Answer:
Let 'a' be the first term, 'r' be the common ratio and 'n' be the number of terms
Series = 2+6+18.......= 2+2•3¹+ 2•3².......= 728
Now,
![Sum = \frac{a( {r}^{n} - 1) }{(r - 1)} \\](https://tex.z-dn.net/?f=Sum%20%3D%20%20%5Cfrac%7Ba%28%20%7Br%7D%5E%7Bn%7D%20-%201%29%20%7D%7B%28r%20-%201%29%7D%20%20%20%5C%5C%20)
So,
![\frac{a( {r}^{n} - 1)}{(r - 1)} = 728 \\ \frac{2( {3}^{n} - 1) }{(3 - 1)} = 728 \\ \frac{2( {3}^{n} - 1) }{2} = 728 \\ {3}^{n} - 1 = 728 \\ {3}^{n}=728+1\\ {3}^{n} = 729 \\ {3}^{n} = {3}^{6} \\ \boxed{ n = 6}](https://tex.z-dn.net/?f=%20%5Cfrac%7Ba%28%20%7Br%7D%5E%7Bn%7D%20-%201%29%7D%7B%28r%20-%201%29%7D%20%20%3D%20728%20%5C%5C%20%20%5Cfrac%7B2%28%20%7B3%7D%5E%7Bn%7D%20-%201%29%20%7D%7B%283%20-%201%29%7D%20%20%3D%20728%20%5C%5C%20%20%5Cfrac%7B2%28%20%7B3%7D%5E%7Bn%7D%20-%201%29%20%7D%7B2%7D%20%20%3D%20728%20%5C%5C%20%20%7B3%7D%5E%7Bn%7D%20%20-%201%20%3D%20728%20%5C%5C%20%7B3%7D%5E%7Bn%7D%3D728%2B1%5C%5C%20%7B3%7D%5E%7Bn%7D%20%20%3D%20729%20%5C%5C%20%20%7B3%7D%5E%7Bn%7D%20%20%3D%20%20%7B3%7D%5E%7B6%7D%20%20%5C%5C%20%5Cboxed%7B%20n%20%3D%206%7D)
Therefore, number of terms is 6
Answer:
kjhgfdzvbjhgfxzawertyuikmnbsertyujnbv
Yes you can i think........
Answer:
B. c= -c+2
Step-by-step explanation:
A. ...................
It has infinitely many solutions as the equation is correct for any value of c.
B. ...................
- c= -c+2
- c+c= 2
- 2c = 2
- c = 2/2
- c= 1
It has one solution only
C. ...................
- c+2=c-2
- c-c= -2 - 2
- 0 = -4
It has no solution as this equation is incorrect
D. ...................
It has no solution as this equation is incorrect