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[tex]\sf{Heya~!}[/tex]
To add 1 to another number, add 10 and then subtract 1: 1 + 10 = 9 + 10 - 1 = 19.
[tex]\mathbb{HOPE~IT~HELPS~YOU~!}[/tex]
[tex]\underline{Answer~:}[/tex]
[tex]\sf{Miwsow}[/tex]