T1B

I'm trying to figure out how to add 2+4+6+8+10....up to 730, without literally adding them all like that. Anybody know how that formula works?

TIA

Fukk calculus.

I don’t know how to do it with a formula, but I do know from a 20-second exercise with a calculator that that pattern will never land on 730.

Screw_Michigan wrote:I'm trying to figure out how to add 2+4+6+8+10....up to 730, without literally adding them all like that. Anybody know how that formula works?

TIA

Do they have to be in that order, and what operations are you restricted to?

-(2 x 4) + 6! + 8 + 10 = 730

It's amazing how much of the math you knew at one time and no longer remember. Wasn't that one of the formulas that Karl Friedrich Gauss figured out in Kindergarten ? My latest job requires me to make up chemical solutions of varying molarity, etc.. I l last studied chemistry in 1958, Google is my best friend.

Wolfman wrote:Wasn't that one of the formulas that Karl Friedrich Gauss figured out in Kindergarten ?

The one thing I remember about Gauss was that he was able to provide his teacher with an answer to the sum of all the numbers from 1 to 100 in a matter of seconds, which is pretty simple, actually.

Took me a few tries to figure this one out, but was able to get it in 5-10 minutes.

Goober McTuber wrote:I don’t know how to do it with a formula, but I do know from a 20-second exercise with a calculator that that pattern will never land on 730.

How do you figure?

Mikey wrote:

Screw_Michigan wrote:I'm trying to figure out how to add 2+4+6+8+10....up to 730, without literally adding them all like that. Anybody know how that formula works?

TIA

Do they have to be in that order, and what operations are you restricted to?

It's like this.

There's this guy who is making money by wearing t-shirts of companies who pay him to wear their logo. His pricing goes like this. You rent by the day. For example, 1/1 costs $2, but it goes up $2 every day afterward, so on 1/31, that day would cost you $62. The last day of the year, 12/31, that day would cost you $730.

That's why I want to figure out 2+4+6+8+10...., basically up to 365 times, to figure out how much he'd gross if he sold out every single day, and he's close to that.

Screw_Michigan wrote:There's this guy who is making money by wearing t-shirts of companies who pay him to wear their logo. His pricing goes like this. You rent by the day. For example, 1/1 costs $2, but it goes up $2 every day afterward, so on 1/31, that day would cost you $62. The last day of the year, 12/31, that day would cost you $730.

That's why I want to figure out 2+4+6+8+10...., basically up to 365 times, to figure out how much he'd gross if he sold out every single day, and he's close to that.

$133,590

Smackie Chan wrote:

Screw_Michigan wrote:There's this guy who is making money by wearing t-shirts of companies who pay him to wear their logo. His pricing goes like this. You rent by the day. For example, 1/1 costs $2, but it goes up $2 every day afterward, so on 1/31, that day would cost you $62. The last day of the year, 12/31, that day would cost you $730.

That's why I want to figure out 2+4+6+8+10...., basically up to 365 times, to figure out how much he'd gross if he sold out every single day, and he's close to that.

$133,590

Thanks. So what's the formula for that?

Screw_Michigan wrote:So what's the formula for that?

I just used Excel. Enter 2, 4, 6 in the first three cells of a column, then drag the lower right corner of those three highlighted cells down to row 365. Excel will auto-fill the rest of the cells. In any empty cell, enter "=sum(top cell #:botttom cell #)", then enter. Voila!

Wolfman wrote: My latest job requires me to make up chemical solutions of varying molarity, etc.. I l last studied chemistry in 1958, Google is my best friend.

Nice way to tempt the Reaper you old fuck...you are getting close enough to the exit door and then you decide to fuck around with chemicals based upon Google research...way to jack up the odds....

Screw_Michigan wrote:

Smackie Chan wrote:

Screw_Michigan wrote:There's this guy who is making money by wearing t-shirts of companies who pay him to wear their logo. His pricing goes like this. You rent by the day. For example, 1/1 costs $2, but it goes up $2 every day afterward, so on 1/31, that day would cost you $62. The last day of the year, 12/31, that day would cost you $730.

That's why I want to figure out 2+4+6+8+10...., basically up to 365 times, to figure out how much he'd gross if he sold out every single day, and he's close to that.

$133,590

Thanks. So what's the formula for that?

= x * (x+1)

365*366 = 133,590

you're welcome

Screw_Michigan wrote:

Goober McTuber wrote:I don’t know how to do it with a formula, but I do know from a 20-second exercise with a calculator that that pattern will never land on 730.

How do you figure?

Group the numbers and get their totals this way:

2 - 10 = 30
12 - 20 = 80
22 - 30 = 130
32 - 40 = 180
42 - 50 = 230

At this point you're at 650. Add 52, you're at 702. Add 54, you're at 756 and past 730.

Smackie Chan wrote:

Wolfman wrote:Wasn't that one of the formulas that Karl Friedrich Gauss figured out in Kindergarten ?

The one thing I remember about Gauss was that he was able to provide his teacher with an answer to the sum of all the numbers from 1 to 100 in a matter of seconds, which is pretty simple, actually.

Took me a few tries to figure this one out, but was able to get it in 5-10 minutes.

5,050, right? If you take out 100 and 50, you have 49 sets of numbers that will add to 100.

49*100=4900
+100
+50
=5050

Killian wrote:5,050, right? If you take out 100 and 50, you have 49 sets of numbers that will add to 100.

49*100=4900
+100
+50
=5050

That works, but there's a slightly easier way. There are 50 pairs of numbers that add up to 101, so 101 x 50 = 5050.

Enter it here, diprag: http://www.wolframalpha.com/