text: There's 3 possibilities\n1. X = 20, 2 dimes             \n2. X = 15, 1 dime 1 nickle\n3. X = 10, 2 nickles\n\nNumber of different combinations: 5C2 = 5 * 4 / 2 * 1 = 10\n\nP(X = 20) :\nNumber of ways of picking 2 dimes out of the 3: 3C2 = 3*2*1/2*1 = 3\nProbability = 3/10\n\nP(X = 15):\nNumber of ways of picking 1 coin each, 3 * 2 = 6\nProbability 6/10\n\nP(X = 10)\nNumber of ways of picking 2 nickles = 1\nProbability 1/10\n\nSo, listed in chart form:\nX, P(X)\n10, 1/10\n15, 6/10\n20, 3/10