Without looking, selects two socks from a drawer which contains four blue, three white and five black socks, none of which are paired up. What is the probability that he chooses two socks of the same color?

Ten times the square of a non-zero number is eqaul to ninety times the number

The table shows the number of students who signed up for different after school activities. activity students cooking 9 chess 4 photography 8 robotics 11 select the true statements about the information in the table.

Find the solution on the interval [0, 2pi)