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View Compilation Error

0_0_13849647_15860.cpp: In function 'int main()':
0_0_13849647_15860.cpp:6:38: error: expected ')' before ';' token
      printf("%d\n\n",(int)((1+n)*n/2);)
                                      ^
0_0_13849647_15860.cpp:6:39: error: expected primary-expression before ')' token
      printf("%d\n\n",(int)((1+n)*n/2);)
                                       ^


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