Question

twenty books are kept on a shelf. six of them are English text books,eight are maths text book,four are physics text books and the remaining are general knowledge books. if one book is picked at random, what is the probability that it is-(1) an English book. (2)any book other than that of general knowledge.

Answer 1

possible outcome=20
favourable outcome of english =6
p(e)= 6/20= 3/10

2nd_------- 18/20= 9/10