Is It Correct that Sum Of the All Numbers To Infinite = -1

Algebra Level 3

True or False?

1 + 2 + 4 + 8 + + 2 n + = 1 1 + 2 + 4 + 8 + \cdots + 2^n + \cdots = -1

(Use the standard system of arithmetic.)

False True

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1 solution

H e r e , Here, I t I s H o w I t s C o r r e c t a b l e . . . It-IsHowItsCorrectable...


1 + 2 + 4 + 8 + 16 + . . . = 1. ( 1 + 2 + 4 + 8... ) 1+2+4+8+16+...=1.(1+2+4+8...)

1 + 2 + 4 + 8 + . . . = ( 2 1 ) . ( 1 + 2 + 4 + 8 + . . . ) 1+2+4+8+...=(2-1).(1+2+4+8+...)

1 + 2 + 4 + 8 + . . . = 2 + 4 + 8 + 16 1 2 4 8 16 1+2+4+8+...=2+4+8+16-1-2-4-8-16

1 + 2 + 4 + 8 + . . . = 1 1+2+4+8+...=-1

I can't understand how you got +ve = -ve?

A Former Brilliant Member - 4 years, 9 months ago

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The question is the sum of all even numbers like 2^n form is equal to -1 There is virgate of number if you multiply by splitting the number in sort of substraction as 1 is splite as (2-1) then what it gives by multipling the terms will be Positive and negative. also this could be only in case of even numbers to be an equality.

A Former Brilliant Member - 4 years, 9 months ago

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I can't understnad what you are saying. Will you write it in equations.

A Former Brilliant Member - 4 years, 9 months ago

I'm sorry but this is wrong. The explanation is very simple actually;the L.H.S is the sum of positive numbers only,so it will never equal a negative number.

Abdur Rehman Zahid - 4 years, 9 months ago

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do you have better solution that sum of +ve numbers equal to -1???

A Former Brilliant Member - 4 years, 9 months ago

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I'm saying that the statement 1 + 2 + 4 + 8 + + 2 n = 1 1+2+4+8+\cdots+2^n=-1 is wrong. Therefore, there isn't any solution at all to show that this statement is true.I was simply proving how it was wrong in my first comment,not how it was right.

Abdur Rehman Zahid - 4 years, 9 months ago

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@Abdur Rehman Zahid oh,sorry for my ignorance you are absolutely right its wrong statement, but i just clarify that it would have a solution that maybe errored or perhaps wrong .

A Former Brilliant Member - 4 years, 9 months ago

Let the observe ,clear that its not sum of all the numbers i.e. natural numbers instead it is about even numbers only.

A Former Brilliant Member - 4 years, 9 months ago

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I did not say that it was the sum of all numbers;I simply said that it was the sum of positive numbers (which can never equal a negative number)

Abdur Rehman Zahid - 4 years, 9 months ago

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@Abdur Rehman Zahid yes,but i didnt say you are wrong instead i stressing on that point out on which i need to clarify.

A Former Brilliant Member - 4 years, 9 months ago

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