7 items are filed under this topic.
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1+2+4+8....= -1 |
2012-04-02 |
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From Andy:
In this minutephysics video, it's claimed that 1+2+4+8....= -1
Is this true, and if so, how?
< href="http://www.youtube.com/watch?v=kIq5CZlg8Rg">http://www.youtube.com/watch?v=kIq5CZlg8Rg
Answered by Robert Dawson. |
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1/1+1/2+1/3... |
2010-03-31 |
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From Mohd:
you explained the way of getting the summation of 100 series numbers
but what is the summation of the numbers 1/1+1/2+1/3+1/4+1/5.............................+1/100
Answered by Robert Dawson. |
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Summation Notation |
2009-12-28 |
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From MANDIRA:
I want to get the formula for expressing one number by summation of consucutive numbers .
Answered by Janice Cotcher. |
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Total payments for a loan |
2007-10-11 |
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From Robin:
A person is going to arrange a loan at 3 mill. he will pay 150000 back each year , so it
take 20 yrs. to finish. In addition he pays 5% interest of what is leaft each year.
How do I find the sum-function which shows the total sum he have payed?
Answered by Stephen La Rocque. |
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The odd numbers from 30 to 80 |
2006-09-21 |
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From Kieran:
If you added all the odd numbers from 30 to 80, would the answer be even or odd? Explain.
I think it would be odd because I used this equation:
(30 x 5)+(40 x 5)+(50 x 5)+(60 x 5)+(70 x 5)+(25 x 5)=1325
I used the numbers for each set of ten -30 to 80 times 5 and the amount of the endings-1,3,5,7,9- added, times 5. Is that right?
Answered by Penny Nom. |
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Proving a summation formula by induction |
2006-04-19 |
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From Sharon:
Prove by induction that the sum of all values 2^i from i=1 to n equals 2^(n+1) - 2 for n > 1.
Answered by Stephen La Rocque. |
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1+3+5+...+(2n+1) |
2004-09-10 |
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From Emma:
Prove that 1+3+5+...+(2n+1)= (n+1)2
Answered by Penny Nom. |
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