Well, honey, if you've got 4 checkboxes, you've got yourself 2 to the power of 4 combinations, which equals 16. So buckle up and start checking those boxes, because the possibilities are endless... well, 16 to be exact.
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Assuming there are 5 check boxes and the respondent may check any number of them, the answer is 24 = 16 combinations.
There are 1 combination of 4 colours out of 4, 4 combinations of 3 colours out of 4, 6 combinations of 2 colours out of 4, 4 combinations of 1 colour out of 4. A grand total of 15 (= 24-1) combinations.
256 iThink * * * * * It depends on combinations of how many. There is 1 combination of 4 letters out of 4, 4 combinations of 3 letters out of 4, 6 combinations of 2 letters out of 4, 4 combinations of 1 letter out of 4. Than makes 15 (= 24-1) in all. Well below the 256 suggested by the previous answer.
16
one
There are 210 4 digit combinations and 5040 different 4 digit codes.