The standard dental formula for an adult human is 3.1.2.3/3.1.2.3, representing incisors, canines, premolars, and molars in each quadrant. The options provided are variations. Option 'a' (3132 2313) and 'в' (3212 2321) are incorrect. Option 'б' (2012 2102) is also incorrect. Option 'г' (3212 2123) is the closest to a common variation, though the standard is 3.1.2.3. However, given the options, 'г' is the most plausible representation of a dental formula, possibly indicating a specific variation or simplified notation.