in a class of 80 students every student studied economic or geography or both If 65students study economic and 50students study geography how many students study both subjects​

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.