Validate using two columns

[shreyasanand07]

Hi, I am looking for implementing validation rule by using two columns. For example. assume that there are three columns in a table let's say A, B, C are the three columns, suppose C is a result of column A * B. So I want to implement a rule which can compare A*B equals C for all the rows.
So can anyone please help me what expectation I can use to achieve this.
Thanks in advance.