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In a class 40% students read Mathematics,25% Biology and 15% both Mathematics and Biology.One student is selected at random. The probability that he reads Biology if he reads Mathematics is

In a class 40% students read Mathematics,25% Biology and 15% both Mathematics and Biology.One student is selected at random. The probability that he reads Mathematics if it is known that he reads Biology is

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only one book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. How many total numbers of books are placed in between book history and biology ?

In a class, 40% students study mathematics, 25% study biology and 15 % study both mathematics and biology. One student is selected at random. Find the probability that (i) he studies mathematics if it is known that he studies biology (ii) he studies biology if it is known that he studies mathematics.

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only two book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. Which book is placed immediately above biology ?

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only two book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. Which book is placed immediately above biology ?

Four books, one each in Chemistry, Physics, Biology and Mathematics are to be arranged in a shelf. In how many ways can this be done?

Seven books Math,English,Physics, Chemistry , Biology, Hindi, Histroy are arranged one above another. Only two books are placed above chemistry book. Only two book is placed between history and Biology as between box biology and math. Three boxes are placed between box English and physics. English is placed above physics. Which of the following is true regarding English book ?