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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1 The price of the examination can be anywhere from $250 to $300. 2  The geographical location can also play a factor. 3  For example, the state of Coloradoâs pricing for the exam certification is not much different from the ones being offered on some locations.