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Which brain structure converts short term memory to long term memory ?

Each of question given below is based on the given diagram. The diagram show students studying either Physics, Chemistry, Biology or combinations of these subjects. Which of the following is NOT represented in the above diagram ? 1)The students who study Biology, Chemistry as well as Physics. 2)The students who study Chemistry and Biology but not Physics 3)The students who do not study any of the three subjects. 4) The students who study Biology but not Physics and Chemistry. 5) The students who study Physics and Chemistry but not Biology.

The respective ratio between total number of students studying in College A and College B is 5:8 .In College B , out of the total number of students , 5/8th are boys , out of which 60% study commerce and the remaining 800 boys study in other streams .What is the total number of students in College A ?