Guest Posted August 11, 2008 Report Share Posted August 11, 2008 what is the next number(s) in the sequence? bonus points if you can also add the formula for each seaquence 1) 1.5, 5, 11.5, 20, 27.5 ... 2) 2.25, 1.5, 1.41666666(recurring), 1.5, 1.65 ... 3) 1, 0, -3, -8, -15 ... 4)3.2, 1.9, 1.6, 1.55, 1.6 ... p.s. can you use spoiler boxes good luck Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 11, 2008 Report Share Posted August 11, 2008 has no-one got it yet? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 11, 2008 Report Share Posted August 11, 2008 3) 1, 0, -3, -8, -15 ... -24, -35..? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 11, 2008 Report Share Posted August 11, 2008 Another math sequence puzzle? Argh! *puzzlegirl pulls her hair out* I'm not smart enough for these!! Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 11, 2008 Report Share Posted August 11, 2008 3) 1, 0, -3, -8, -15 ... -24, -35..? thats right can someone give me a formula or any of the other sequences Quote Link to comment Share on other sites More sharing options...
0 EventHorizon Posted August 11, 2008 Report Share Posted August 11, 2008 thats right can someone give me a formula or any of the other sequences 2. F(x) = (8+x^2)/4x starting with x=1 3. F(x) = 1-x^2 starting at x=0 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 11, 2008 Report Share Posted August 11, 2008 thats right can someone give me a formula or any of the other sequences I actually didn't create a formula, i just noticed a pattern. -1, -3, -5, -7.. go up by odd numbers and subtract them. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 12, 2008 Report Share Posted August 12, 2008 I actually didn't create a formula, i just noticed a pattern. -1, -3, -5, -7.. go up by odd numbers and subtract them. Weeeeellllllllll..........I think a formula could be described as a pattern, as long as the changes are always the same rate, or something like that... Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 12, 2008 Report Share Posted August 12, 2008 what is the next number(s) in the sequence? bonus points if you can also add the formula for each seaquence 1) 1.5, 5, 11.5, 20, 27.5 ... 2) 2.25, 1.5, 1.41666666(recurring), 1.5, 1.65 ... 3) 1, 0, -3, -8, -15 ... 4)3.2, 1.9, 1.6, 1.55, 1.6 ... p.s. can you use spoiler boxes good luck All starting at x = 0:(x^4 / 12) + (x^3 / 3) + (13 * x^2 / 12) + (13 * x / 6) + 1.5(x^4 / 60) - (11 * x^3 / 60) + (23 * x^2 / 30) - (27 * x / 20) + (9 / 4)1 - x^2(x^4 / 40) - (11 * x^3 / 40) + (23 * x^2 / 20) - (11 * x / 5) + (16 / 5) Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 12, 2008 Report Share Posted August 12, 2008 (edited) everyone is over-complicating it here is the formulas i got 1) 1.5, 5, 11.5, 20, 27.5 ... (n/2)+(n^2) 2) 2.25, 1.5, 1.41666666(recurring), 1.5, 1.65 ...n/4 + 2/n 3) 1, 0, -3, -8, -15 ... 2n-n^2 4)3.2, 1.9, 1.6, 1.55, 1.6 ... (3/n)+(n/5) Edited August 12, 2008 by theshredder157 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 12, 2008 Report Share Posted August 12, 2008 a few guesses.... Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 12, 2008 Report Share Posted August 12, 2008 just guess, no formula1. next is 80...it's N2x4,for each even number of it...for odd can't figure out the formula yet 2. maybe 1.5- every second member is 1.5..... 3. it's always minus odd number so next is -24, -35.... Quote Link to comment Share on other sites More sharing options...
0 EventHorizon Posted August 12, 2008 Report Share Posted August 12, 2008 (edited) All starting at x = 0:(x^4 / 12) + (x^3 / 3) + (13 * x^2 / 12) + (13 * x / 6) + 1.5(x^4 / 60) - (11 * x^3 / 60) + (23 * x^2 / 30) - (27 * x / 20) + (9 / 4)1 - x^2(x^4 / 40) - (11 * x^3 / 40) + (23 * x^2 / 20) - (11 * x / 5) + (16 / 5) yeah......Of course you can increase the degree of the polynomial and throw it all in a matrix to get coefficients that will work....but do you really think the author meant for all these to be high degree polynomials? And theshredder157...you missed #1 (your 2 is equivalent to mine). But great job getting number 4 (I'm not positive that's correct since I didn't write the problem....but it's nice and concise) I just noticed that you (theshredder157)are the op. You apparently have some errors in the lists you provided if those are the right formulas. Edited August 12, 2008 by EventHorizon Quote Link to comment Share on other sites More sharing options...
0 Guest Posted August 12, 2008 Report Share Posted August 12, 2008 i made up the sequences and formulas from scratch and i double checked it all on a calculator i cant see a mistake in my math maybe we read the formulas differently or something Quote Link to comment Share on other sites More sharing options...
Question
Guest
what is the next number(s) in the sequence?
bonus points if you can also add the formula for each seaquence
1) 1.5, 5, 11.5, 20, 27.5 ...
2) 2.25, 1.5, 1.41666666(recurring), 1.5, 1.65 ...
3) 1, 0, -3, -8, -15 ...
4)3.2, 1.9, 1.6, 1.55, 1.6 ...
p.s. can you use spoiler boxes
good luck
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