There are a total of 9 chocolates - 3 each in the flavors of cherry, coffee and orange. There are also 4 children. If each child is allowed to choose their own favorite flavor, what is the probability that all of them will get flavors of their choice?
At present, Rehu's age (in years) is 9 more than the square of her daughter Cho's age. When Cho grows to her mother's present age, Rehu's age would be 2 year less than 13 times the present age of Cho. Find the present ages of both Rehu and Cho.