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With a Latin alphabet of 26 letters and the 10 digits 0...9, and allowing for repeats, you get:

36^4 = 36 × 36 × 36 × 36 = 1,679,616 combinations.

If you were to include both lower and upper case characters, the number of possible combinations goes up (due to 26 lower case letters + 26 upper case letters + 10 digits = 62 characters to choose from):

62^4 = 14,776,336.

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โˆ™ 2014-10-04 07:04:41
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Q: How many possible alpha numeric combinations are there using all letters for 4 characters?
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