According to Ranganathan, many collections lose its relevance in how many years?
(A) 20 years. (B) 30 years (C) 40 Years (D) 50 years.
Shannon and Weaver related to
(A) Psycho-biology of language An introduction to dynamic philosophy
(B) Information is data of value to decision making (C) Mathematical Theory of Information (D) Bradford’s Law of Information