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shg, total hari yg dilewati = (6 x 366) + (19 x 365) = 9131 hari
9131 mod7 = 3 mod7 (sisa 3 hari)
misal, sandi lahir pada hari x. maka :
x + 3 = jumat
x = jumat - 3 hari = selasa
jadi, sandi lahir pada hari selasa