Question

qual o calculo do 15° termo da PA {5,10,15}

Answer 1

$<var>a_{n}=a_{1}+(n-1)r \\\\\begin{cases}a_{n}=?\\a_{1}=5\\n=15\\r=10-5=5\end{cases}\\\\a_{15}=5+(15-1)5\\a_{15}=5+75-5\\a_{15}=75</var>$

 

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