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10. rumus suku ke-n = n+(n-1)
jadi 25+(25-1) = 25+24 = 49
11. rumus suku ke-n = n*8+4
jadi 60*8+4 = 484
12. rumus suku ke-n = n(n-3)
jadi 8(8-3) = 8*5=40