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Here is a question regarding permutations and combinations: If we have 5 letters A, B, C, D, and E, how many combinations of 3 letters can be formed without regard to order? To solve this, we use the combination formula: nCr = n! / (r!(n-r)!) Where: n = total number of objects = 5 letters r = number of objects in each combination = 3 letters Plugging into the formula: 5C3 = 5! / (3!(5-3)!) = 5! / (3!2!) = 10 Therefore, the number of combinations of 3 letters that can be formed from

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