Ella makes a smoothie for breakfast every morning. Today, she wants to use melon, apple, orange, and peach. In how many different ways (orders) can she add these fruits to her blender?

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Ответ:

suicune19

26.09.2021

Mathematics

$a_{11}=a_{10}r$
$a_{12}=a_{11}r=a_{10}r^2$

Since $a_{10}=1$ , we have $a_{12}=r^2=\dfrac1{25}$ , which means $r=\pm\dfrac15$ .
Now,

a_2=a_1r

$\cdots$
$a_{10}=a_9r=\cdots=a_1r^9$

Since $a_{10}=1$ and $r=\pm\dfrac15$ , we get

$a_1=r^{-9}=\pm5^9$

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