1000 words can be made using 10 letters if repetition is allowed.
A permutation is the number of different ways a set can be organized; order matters in permutations, but not in combinations.
We have:
Number of letters = 10
For first position, number of ways = 10
For second position, number of ways = 10
For third position, number of ways = 10
Total ways = 10×10×10 = 1000
Thus, 1000 words can be made using 10 letters if repetition is allowed.
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