View Compilation Error

0_0_33709113_31851.cpp: In function 'int main()':
0_0_33709113_31851.cpp:26:44: error: 'n2' was not declared in this scope
   ll a1 = qPow(2,n),a2 = qPow(3,n),a3=qPow(n2,mod-2);
                                            ^