hello, could you plz provide step by step explanation if possibile

5. A fair dice is rolled TEN times. Determine the following probabilities: (a) A 5 is rolled exactly three times. (b) At least two 4's are rolled. 6. A recent study shows that 5% of patients who take a specific medicine experience side effects. Suppose that 100 patients taking this medicine are selected at random. Determine the following probabilities: (a) At least 5 patients experience side effects. (b) At least 20 patients experience side effects