Dear Freinds ,

Please give your valuable suggestion and the formula of below question.

Q1. A retrieval system retrieves a total of 50% documents, out of these 40 are irrelevant.Another 10 document which where relevant were not retrieved . The Precision percentage of that query would be ?

Ans.

A} 40%

B} 20%

C}60%

D} 80%

Given ans is :- B} 20%