In a group of 23 pupils, 4 play the flute only. 3 play the piano only. 15 play neither instrument. A student is selected at random. What is the probability the student plays both instruments?

50 people men and women were asked if they watched at least one sport on tv. 20 of the people surveyed are women, but only 9 of them watch at least one sport on tv. 16 of the men watch at least one sport on tv. make a a two-way table and a relative frequency table to represent the data.