A class without constructor (or deleted constructor) can exist.

ch7/7.46.md

@@ -1,6 +1,24 @@
 (a) A class must provide at least one constructor.
 
-  True. If the programmer doesn't provide any constructor, the compiler will synthesise one default constructor.
+  False. 
+  This is valid code:
+  ```
+  #include <iostream>
+
+  class C {
+  public:
+    C() = delete;
+    static int a;
+  };
+
+  int C::a = 1;
+
+  int main() {
+    std::cout << C::a << std::endl;
+    return 0;
+  }
+  ```
+
 
 (b) A default constructor is a constructor with an empty parameter list.