Zeno has to go a distance, d, to get to his destination. He claims he can never get there because he has to travel half that distance d, then half of half of distance d, and so on. He says that he has to do an infinite number of tasks and that it is impossible. Use an infinite geometric series to help Zeno. Identify a1 and r to form the infinite geometric series that represents the problem.

Geometric sequence a sequence of non-zero numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio.

i.e. [tex]a+ar+ar^2+ar^3+......[/tex]

Here, [tex]a=[/tex] First term and [tex]r=[/tex] common ratio

Next term formula, [tex]a_{n} =a_{1}\ *\ r^{n-1}[/tex]

We have,

[tex]d=[/tex] distance to her destination,

Now,

According to the question;

Zeno has to travel half that distance i.e. [tex]\frac{d}{2}[/tex],

Then half of half of distance i.e. [tex]\frac{d}{4}[/tex],

Then half of [tex]\frac{d}{4}[/tex] distance i.e. [tex]\frac{d}{8}[/tex] and so on.

So,

Here, we have,

[tex]\frac{d}{2},\frac{d}{4},\frac{d}{8}, .........[/tex]

So,

We have Geometric Sequence,

Here,

[tex]a_{1} =\frac{d}{2}[/tex] and

Now,

[tex]r=[/tex] common ratio,

[tex]r=\frac{a_{2} }{a_{1} }[/tex]

[tex]r=\frac{\frac{d}{4} }{\frac{d}{2} }[/tex]

We get,

[tex]r=\frac{1 }{2 }[/tex]

So, These are [tex]a_{1} =\frac{d}{2}[/tex] and [tex]r=\frac{1 }{2 }[/tex] of the Geometric sequence.

Hence, we can say that he [tex]a_{1} =\frac{d}{2}[/tex] and [tex]r=\frac{1 }{2 }[/tex] are for the infinite Geometric sequence.

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