A fallacy Explain the fallacy in the following argument.

Chapter 10, Problem 55AE

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QUESTION:

A fallacy Explain the fallacy in the following argument. Let

\(x=\frac{1}{1}+\frac{1}{3}+\frac{1}{5}+\frac{1}{7}+\cdots\)    and     \(y=\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}+\cdots\).

It follows that 2y = x + y, which implies that x = y. On the other hand,

\(x-y=(\underbrace{\left.1-\frac{1}{2}\right)}_{>0}+(\underbrace{\left.\frac{1}{3}-\frac{1}{4}\right)}_{>0}+(\underbrace{\frac{1}{5}-\frac{1}{6}}_{>0})+\cdots>0\)

is a sum of positive terms, so x > y. Thus, we have shown that x = y and x > y.

Questions & Answers

QUESTION:

A fallacy Explain the fallacy in the following argument. Let

\(x=\frac{1}{1}+\frac{1}{3}+\frac{1}{5}+\frac{1}{7}+\cdots\)    and     \(y=\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+\frac{1}{8}+\cdots\).

It follows that 2y = x + y, which implies that x = y. On the other hand,

\(x-y=(\underbrace{\left.1-\frac{1}{2}\right)}_{>0}+(\underbrace{\left.\frac{1}{3}-\frac{1}{4}\right)}_{>0}+(\underbrace{\frac{1}{5}-\frac{1}{6}}_{>0})+\cdots>0\)

is a sum of positive terms, so x > y. Thus, we have shown that x = y and x > y.

ANSWER:

Problem 55AE

A fallacy Explain the fallacy in the following argument. Let  and  it follows that 2y = x + y, which implies that x = y. On the other hand.

is a sum of positive terms, so x > y. Thus, we have shown that x = y and x > y.

Answer;

     Step 1;

                Let , x = + + + +..........                ….........(1)

     

                 And  y = + + + +............             ……………(2)

         We can write the given series as ;

              X =  , and y =  and it follows that 2y = x+y  which implies that x=y , on other hand x -y > 0,

                               2y = x+y ,

                       

                      then 2y -y = x

                                   Y = x , then x - y = 0 ,  on other hand x -y > 0 , by using these two results the given argument is fallacy.

                         

  Fallacy is an incorrect result which has an apparently logical explanation of why the result is correct, or a correct result obtained through incorrect reasoning.

     E.g ;  =  = “ by canceling sixes”.

 

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