Page Rank

Equation to calculate PageRank (PR) was published by Google long back when they where developing PR, it’s as follows:-

PR(A) = (1-d) + d(PR(t1)/C(t1) + ... + PR(tn)/C(tn))

't1 - tn' are pages linking to page A,
'C' is the number of outbound links that a page has,
'd' is a damping factor, usually set to 0.85.

But now Google uses a variation of it, no one out side Google knows about the variation. It doesn't matter though, as this equation is good enough