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Jumlah: 13 + 17 = 30
n + (n + 2) + (n + 4) = 45
3n + 6 = 45
3n = 39
n = 13
besar + kecil
= (n + 4) + n
= 2n + 4
= 2(13) + 4
= 26 + 4
= 30