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Originally posted by ManFromEurope
Did you try something easy like feeding excel your numbers and letting it calculate a best-fit-curve?
Anyway, I did:
Best fit (exponential): y = 2.3737 e^1.0845 (fitting index 0.9584)
Best fit (linear): y = 31x -30.667 (fitting index 0.845)
Best fit (logarithmic, *not very good for this data*): y = 51.601 ln(x) + 0.5147 (fitting index 0.7225)
Best fit (polynomic): y = 23x^2 -61x+46 (fitting index 1, as expected by only 3 datapoints and a formula with x^2)
Best fit (potency): y = 6.8004x^1.8694 (fitting index 0.8789)
Okay, the very best is obviously the fourth formular (polynomic), which would give you y(4) = 170, y(5) = 316.
If this has to be an exponential formular, it would give you y(4) = 181.7169 and y(5) = 537.5114.
Originally posted by rival
reply to post by scratchmane
Need more info...
You might have falsely inferred that the next number in succession is a simply calculation
of proportion. Could this be an IQ type question where every possible answer from every possibly
angle must be calculated?
So where did you get the question? Homework from math class? More info please....
Originally posted by scratchmane
I would like some help from some of you who are good at math.
I would like to know the steps following:
1: 8
2: 16
3: 70
Between step 1 and 2 there is a 100% increase. Between 2 and 3 there is a 437,5 % increase. What is step 4 and 5 following the same exponential trend?
I am not sure how to calculate the next steps, so help is appreciated.
Edit: not sure if this is correct forum, but seemed the best place.edit on 4-6-2013 by scratchmane because: (no reason given)
Originally posted by Benevolent Heretic
reply to post by scratchmane
Is it printed just as you have it here, with colons?
1: 8
2: 16
3: 70
or
1. 8
2. 16
3. 70
Originally posted by luciddream
reply to post by firemonkey
Awesoem job, how did you come around to that formula? trial and error?
i was crunching some numbers.. i even went into the exponential growth formula lol.. i ave up after 20 mins.
Originally posted by Crakeur
Folks, this is ATS, these are not numbers in a sequence, these are codes in the bible that indicate Col. Mustard did it with the knife, in the study.
well done firemonkey and welcome to ATS.
Originally posted by firemonkey
I love number sequences...so I had to register just to solve it for you
8, 16, 70, 496, 3852
8^x + 8 - (x^x - x)
x=0
8^0 + 8 - (0^0 - 0)
1 + 8 - (1 - 0)
1 + 8 - 1 = 8
x=1
8^1 + 8 - (1^1 - 1)
8 + 8 - (1 - 1)
8 + 8 - 0 = 16
x=2
8^2 + 8 - (2^2 - 2)
64 + 8 - (4 - 2)
64 + 8 - 2 = 70
x=3
8^3 + 8 - (3^3 - 3)
512 + 8 - (27 - 3)
512 + 8 - 24 = 496
x=4
8^4 + 8 - (4^4 - 4)
4096 + 8 - (256 - 4)
4096 + 8 - 252 = 3852
Originally posted by Crakeur
Folks, this is ATS, these are not numbers in a sequence, these are codes in the bible that indicate Col. Mustard did it with the knife, in the study.
well done firemonkey and welcome to ATS.