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How many 4-letter codes can be formed using the first 10 letters of the English alphabet, if no letter can be repeated?

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Best answer

Given: 

first 10 letters of the English alphabet. In 4 letter code for first position there are 10 possibilities for second position there are 9 possibilities, for third position there are 8 possibilities and for fourth position there are 7 possibilities since repetition is not allowed. 

So total numbers of combination=10 × 9 × 8 × 7 = 5040

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