All 4 letters are similar, and 3 letter boxes are also similar.
Explanation:
Both letters and letter boxes are similar here.
Now, we will have to just do the grouping of letters.
LB LB LB Case 1 4 0 0 Case 2 3 1 0 Case 3 2 1 1 Case 4 2 2 0
It does not matter which letter box has how many letter since letter boxes are all similar.
∴ There are 4 ways of posting 4 similar letters in 3 similar letter boxes.
Hence, 4.
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