View Compilation Error

0_0_35134739_32045.cpp: In function 'int main()':
0_0_35134739_32045.cpp:118:43: error: expected primary-expression before '/' token
         double res = p * (n - ((1 - p) *  / p)) + (1 - p) * (n - (p *  / (1 - p)));
                                           ^
0_0_35134739_32045.cpp:118:72: error: expected primary-expression before '/' token
         double res = p * (n - ((1 - p) *  / p)) + (1 - p) * (n - (p *  / (1 - p)));
                                                                        ^