A lamina occupies the region inside the circle x2 + y2 = 14y but outside the circle x2 + y2 = 49. Find the center of mass if the density at any point

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.