diff --git a/题库0.3/Problems.json b/题库0.3/Problems.json
index 66a188b3..ca11eb88 100644
--- a/题库0.3/Problems.json
+++ b/题库0.3/Problems.json
@@ -698365,7 +698365,7 @@
         "unrelated": []
     },
     "030178": {
-        "id": "030179",
+        "id": "030178",
         "content": "投掷两颗做子, 得到其向上的点数分别为$m$和$n$, 则复数$(m+n\\mathrm{i})(n-m\\mathrm{i})$为实数的概率为\\bracket{20}.\n\\fourch{$\\dfrac 13$}{$\\dfrac 14$}{$\\dfrac 16$}{$\\dfrac 1{12}$}",
         "objs": [
             "K0803002B"