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template<class T1;class T2;class T3> is a syntax error
the semicolons should be changed to commas
template<class T1, class T2, class T3>

need to overload *?

Yes I also think you need to overload*

A lot of these questions are from the brainbench C++ test.

The return type needs to be compatible with the expression a*b*c. Thus a*b needs to return a type that can be multiplied with c and (a*b) * c needs to return an int (or the return type of the function needs to be changed).

Unless all the three template variables type are either int,float,double its behaviour is undefined

Compiled and run the following:

1 #include <stdio.h>
2
3 template<class T1, class T2, class T3>
4 int Pr(T1 a,T2 b,T3 c)
5 {
6 printf("a: %f b: %f c:%f\n",a,b,c);
7 return a*b*c;
8 }
9
10 int main()
11 {
12 int x = Pr(1.1,2.1,3.1);
13 printf("%d\n",x);
14 return 0;
15 }

Output:
a: 1.100000 b: 2.100000 c:3.100000
7

So I see, either there is typo with ";" or there is syntactically nothing wrong. I am not sure whether the question involves semantic error of any kind.