Can you help me with this question please?

Answer 1

This is the question; Suppose you have several coloured balls. Two of the balls are red, and have the letters B and E on them. Two of the balls are green, and have the letters M and R on them. Two of the balls are orange, and have the letters A and E on them. What letters are on the blue-coloured balls? Please list the letters with no spaces or punctuation in between, and sort the letters in reverse alphabetical order. For example, "ZY" would be an acceptable submission. You appear to have left something out of the puzzle. How are we to know how many blue balls there are, for example? Was there some indication of this and which letters are to be used?