Question 15
Khôi has seven coloured pencils in a box: red, orange, yellow, green, blue, indigo and violet. Each time, Khôi takes out a pencil, writes its Vietnamese colour word, then puts it back. The words are ĐỎ, CAM, VÀNG, LỤC, LAM, CHÀM and TÍM. For example, taking red means writing “ĐỎ”, which has 2 letters. Accent marks do not count as extra letters.
Every pencil is taken out at least once. The seven numbers of times they are taken out are all different. The violet pencil is taken out 9 times, more than any other. What is the greatest total number of letters Khôi could write?
Every pencil is taken out at least once. The seven numbers of times they are taken out are all different. The violet pencil is taken out 9 times, more than any other. What is the greatest total number of letters Khôi could write?