[tex]A_{30} - A_{28}\\\\= (30 + A_{29}) - A_{28}\\= (30 + [29 + A_{28}]) - A_{28}\\= 30 + 29\\= 59[/tex]
59
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[tex]A_{30} - A_{28}\\\\= (30 + A_{29}) - A_{28}\\= (30 + [29 + A_{28}]) - A_{28}\\= 30 + 29\\= 59[/tex]
59