Write the first three terms in each of the following sequences defined by the following:

$a_{n}=2 n+5$

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Here $a_{n}=2 n+5$

Substituting $ n =1,2,3, $ we get 

$a_{1} =2(1)+5=7, a_{2}=9, a_{3}=11$

Therefore, the required terms are $7,9$ and $11 .$

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