- #1
masterofthewave124
- 74
- 0
For the geometric sequence with tn = 2(-1)^n*(1/3)^n
(a) the sum of the first 99 terms
(b) the sum of the odd-numbered terms t1 + t3 + t5 +...+ t99
(c) the sum of the even-numbered terms t2 + t4 + t6 +...+ t98
so do i first maybe want to convert that into something simpler? why would they write it like that in the first place. a = -2/3, r = -1/3 so wouldn't
tn = (-2/3)(-1/3)^(n-1)?
anyways, after doing that, should i turn that equation into Sn = ?
how would i do b) and c)?
(a) the sum of the first 99 terms
(b) the sum of the odd-numbered terms t1 + t3 + t5 +...+ t99
(c) the sum of the even-numbered terms t2 + t4 + t6 +...+ t98
so do i first maybe want to convert that into something simpler? why would they write it like that in the first place. a = -2/3, r = -1/3 so wouldn't
tn = (-2/3)(-1/3)^(n-1)?
anyways, after doing that, should i turn that equation into Sn = ?
how would i do b) and c)?