How many 4 digit numbers can you write using only the digits 2 and 5? With each digit having only 2 possibilities, the answer is 2 to the 4th power, which is 16. The 4 is because there are 4 digits. Think about the binary numbers 0000 to 1111, t â¦ here are 2 possibilities for each digit.
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A: You may wish to submit an Individual Request for Review of CE Activities [PDF Format - 108KB] to KBN requesting contact hours for this course. There is a non-refundable charge of $10 for the review. You can also request an application form by contacting the KBN office at 800-305-2042, ext.