Why a=3, but b =3;

Question

int x(int &a,int &b){
a=1;
b=3;
return a*b;
}
int main()
{
int a=3;
int b=4;
int c=x(b,b) ;
cout<<a<<b<<c;

Answer 1

I am pretty sure that the actual answer should be 133? a and b are sent as reference so the function should be able to modify the values

Answer 2

not ur not((
not 133