[tex]\displaystyle\bf\\a_{n} =2n+1\\\\n=30\\\\a_{30} =2\cdot 30+1=60+1=61\\\\Otvet \ : \ a_{30} =61[/tex]
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[tex]\displaystyle\bf\\a_{n} =2n+1\\\\n=30\\\\a_{30} =2\cdot 30+1=60+1=61\\\\Otvet \ : \ a_{30} =61[/tex]