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Old 03-06-2008, 07:34 PM   #1
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Default A little math problem for you guys

Express this sum in sigma notation:

1-(1/4)+(1/9)-(1/16)+(1/25)

:-D
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01010010011001010110010001100010011001010110000101 11001001100100
010011110111010101110100

There are only 10 kinds of people in this world. Those who can read binary, and those who can't.
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Old 03-06-2008, 08:58 PM   #2
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Default Re: A little math problem for you guys

K. I'm up to it. I'm not going to cheat. I don't know if there is a answer or not but I'll see. There should be. I'll post my answer edited in white.

edit: Got it!

5
E (1/i^2) * (-1^(i+1))
i=1
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Old 03-06-2008, 09:03 PM   #3
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Default Re: A little math problem for you guys

the sum of numbers from i=1 to i=5 of 1/-((-i)^2)

I don't know how to make it look normal so I wrote it like you say it.
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Old 03-06-2008, 09:06 PM   #4
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Default Re: A little math problem for you guys

RubberChicken, I'm not sure if that works. That way you always get a negative number.
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Old 03-07-2008, 06:07 PM   #5
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Default Re: A little math problem for you guys

Quote:
Originally Posted by JogaBonito1502 View Post
RubberChicken, I'm not sure if that works. That way you always get a negative number.
shoot, right... I was thinking 2 to the i, not i to the 2nd
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Old 03-07-2008, 07:22 PM   #6
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Default Re: A little math problem for you guys

Quote:
Originally Posted by Rubber314Chicken View Post
shoot, right... I was thinking 2 to the i, not i to the 2nd
Nice try.

Hint: To alternate positive and negative numbers put (-1)^x. When x is odd its negative, and when x is even its positive. Then if you wanted to reverse this you could put a negative in front of that. I hope I didn't just give the answer away completely ;-P
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Old 03-08-2008, 01:58 AM   #7
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Default Re: A little math problem for you guys

The ultimate, true answer is as followed in white...


42
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Old 03-08-2008, 02:42 AM   #8
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Default Re: A little math problem for you guys

/\lol hahaha

but seriously , im in grade 9 i dont have a clue what ur talking about
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Old 03-08-2008, 05:11 AM   #9
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Default Re: A little math problem for you guys

wt heck kinda math is this if you guys dont mind me asking =D
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