The product of 3 consecutive numbers is 1716. Find their sum.

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- Feb 20th 2010, 06:49 AMDrdjReal Numbers
The product of 3 consecutive numbers is 1716. Find their sum.

- Feb 20th 2010, 06:53 AMe^(i*pi)
- Feb 20th 2010, 07:02 AMDrdj
Thanks so much for the super-swift reply !!

I was kinda stuck at the cubic expression, and how to do a guess-n-check properly - your cube root method was impressive indeed :)

Just out of curiosity, is there a non-algebraic way to solve it ? - Feb 20th 2010, 10:45 AMHallsofIvy
I am a bit puzzled as to why you would want a "non-algebraic" way when algebra works so nicely. However, you could try this- since "three consecutive numbers" are about as close togetheras three integers can be, they must each be approximately 1716/3= 572. Try three consecutive numbers around that.

I am wondering why you titled this "real numbers" when, to be able to talk about "consecutive" they must be integer.

and, of course, this has nothing to do with "Statistics and Probability". - Feb 20th 2010, 10:47 AMe^(i*pi)
- Feb 20th 2010, 11:20 AMMoo
Hi,

But since we're talking about the product of 3 consecutive numbers, it shouldn't be 1716/3, but $\displaystyle \sqrt[3]{1716}$ :D

Without the cube root method, one can try to factor 1716 : /3=572, /2=286, /2=143 and 143=11*13.

So 1716 turns out to be 11*12*13 :D - Feb 21st 2010, 02:31 AMHallsofIvy