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i guess ill just count it out until i start the calculus unit or whatever it is. sorry for the bombardment of questions, had to do geometric sequences and series in the holidays. bastard teacher. 2m - 8, 2m + 4, 5m - 2, are successive terms of G.S. find m.

sorry, what does ln2(512) mean?

oh sorry, i ended up with (-2)^n = -512 hmm... so that means n has to a an odd number. perhaps some old fashion trial and error. -2^3 = -8 -2^5 = -32 -2^7 = -128 -2^9 = -512 so n=9 but there must be a better way than trial and error/

those 2 answer ones always catch me. thanks! one more question. i just got caught at the end of this one. how many terms of the sequence 6, -12, 24, ... are required to give a sum of 1026. i couldn't get past. (-2)^n = 512

thank you very much, been struggling over that one for awhile now. the answer is correct, 9, 6, 4 apparently it could have been 45, -30, 20 aswell [according to textbook]

Find the first 3 terms of a Geometric Sequence given that the sum of the first four terms is 65/3 and the sum to infinity is 27. any help appreciated.