View Compilation Error

0_0_25536657_13132.cpp: In function 'long long int C(long long int, long long int, long long int)':
0_0_25536657_13132.cpp:56:48: error: too few arguments to function 'long long int mul(long long int, long long int, long long int)'
   ans = mul(ans,(mul(a,GetInverse(b, mod),mod))) % mod;
                                                ^
0_0_25536657_13132.cpp:5:4: note: declared here
 ll mul(ll a,ll b,ll mod)
    ^