Que: If I throw 3 standard 7-sided dice, what is the probability that the sum of their top faces equals to 21? Assume both throws are independent to each other. a. \(\frac{1}{273}\) b. \(\frac{2}{235}\) c. \(\frac{1}{65}\) d. \(\frac{2}{9}\) Answer: \(\frac{1}{273}\)