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 April 7th, 2014, 09:29 AM #21 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs I actually showed you that method.
 April 8th, 2014, 02:39 AM #22 Newbie   Joined: Apr 2014 From: Earth Posts: 14 Thanks: 0 I remember you didn't show me the method I was looking for because none of your methods have $\displaystyle 5×11=55$
April 8th, 2014, 03:01 AM   #23
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Quote:
 Originally Posted by XPMai I remember you didn't show me the method I was looking for because none of your methods have $\displaystyle 5×11=55$
Quote:
 Originally Posted by MarkFL What is the state method? If you are going to do sums, then you need to know these formulas eventually. edit: You could state: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = (1 + 10) + (2 + 9) + (3 + + (4 + 7) + (5 + 6) = 5(11) = 55 But this would be tedious if you had the first 1000 natural numbers.
Hmmm...5 times 11.

April 8th, 2014, 03:58 AM   #24
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Hello MarkFL,

Oh, although your method mentioned $\displaystyle 5×11=55$ but you were not specific.

You only show me long addiction but did not explain clearly like me and also did not explain how did you get $\displaystyle 5$.

In addiction, you did not say $\displaystyle 5×11=55$, you said 5(11)=55

Mai

Quote:
 Originally Posted by MarkFL What is the state method? If you are going to do sums, then you need to know these formulas eventually. edit: You could state: $\displaystyle 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 =$ $\displaystyle (1+10) + (2+9) + (3+ + (4+7) + (5+6) =$ $\displaystyle 5(11) = 55$ But this would be tedious if you had the first 1000 natural numbers.

April 8th, 2014, 04:06 AM   #25
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Quote:
 Originally Posted by XPMai Hello MarkFL, Oh, although your method mentioned $\displaystyle 5×11=55$ but you were not specific. You only show me long addiction but did not explain clearly like me and also did not explain how did you get $\displaystyle 5$. In addiction, you did not say $\displaystyle 5×11=55$, you said 5(11)=55 Mai
I was not specific? I specifically and clearly showed you several ways to add these numbers. You're welcome.

April 8th, 2014, 12:03 PM   #26
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Quote:
 Originally Posted by XPMai ...the method I was looking for...
Say there are m methods: how would anybody know which one
you're looking for? Your statement makes no sense.
Are you sure you're from "earth"

 April 8th, 2014, 12:14 PM #27 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs I have two other methods for deriving the summation formula for arithmetic progressions involving linear difference equations, but something tells me "these aren't the 'droids you're looking for."
April 10th, 2014, 03:17 AM   #28
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Hello,

I was too busy wasn't have time to respond.

Quote:
 Originally Posted by MarkFL I was not specific? I specifically and clearly showed you several ways to add these numbers. You're welcome.
You didn't tell me how you got $\displaystyle 5$, actually $\displaystyle 10÷2=5$.

Quote:
 Originally Posted by Denis Say there are m methods: how would anybody know which one you're looking for? Your statement makes no sense. Are you sure you're from "earth"
I know there're many methods, but I stated that I need Primary School method but you given me "formula" button which isn't Primary School, right?

Yes, I am from earth, a living thing on earth.

Quote:
 Originally Posted by MarkFL I have two other methods for deriving the summation formula for arithmetic progressions involving linear difference equations, but something tells me "these aren't the 'droids you're looking for."
Yes, first I forgot to mention Primary School method because I thought there are a few that's why you given me formula method. After that you given me normal method but difficult to understand because many unknown numbers,
Like $\displaystyle 7=2×4-1$, there are many possibilities like $\displaystyle 7=2×3+1$.
And not all numbers that method can work, you said need to do formula method.

Mai

April 10th, 2014, 05:38 AM   #29
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Quote:
 Originally Posted by XPMai I know there're many methods, but I stated that I need Primary School method but you given me "formula" button which isn't Primary School, right?
I don't know. I discovered that formula in 2nd grade (~8 years old) and only learned about the one you mentioned many years later. Of course I didn't express it as elegantly as Mark, but what do you expect?

 April 10th, 2014, 05:58 AM #30 Newbie   Joined: Apr 2014 From: Earth Posts: 14 Thanks: 0 You learnt formula at $\displaystyle 8$ years old? Unbelievable! (Y) Your Maths should be very good.

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