find Sn for geometric sequence with a1 = 8, n = 9, and r = -1?
Sn = a1(1-r ^n) / (1-r)
= 8(1-1)/(1+1) = 8(0)/2
= 0
is this correct..?
Sn = a1(1-r ^n) / (1-r)
= 8(1-1)/(1+1) = 8(0)/2
= 0
is this correct..?
1 answer
1 answer
1 answer
1 answer