Question: Four balls are drawn (with replacement) from a box containing N different balls labeled A, B, C, .... The ordered result is noted (eg as

Four balls are drawn (with replacement) from a box containing N different balls labeled A, B, C, .... The ordered result is noted (eg as CRCF). Consider two general types of ordered sets, those that have three of the same letter plus a different letter (such as EWEE), and those that have two pairs of letters (such as JDDJ). What kind are there more? Justify the answer taking into account that they are ordered sets.

That is the statement of the exercise. They don't give me anything else and I don't know how to solve it.

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