A complex number can be visually represented as a pair of numbers (a, b) forming a vector on a diagram called an Argand diagram, representing the complex plane. Re is the real axis, Im is the imaginary axis, and i is the imaginary unit which satisfies i2 = â1.
When discussing blood types, the two groupings most commonly used are the ABO (A, B, AB, O) and Rh (+, -) systems. The least common blood type in humans is Bombay (EXTREMELY râ¦are), which is a type O with missing H antigen. Otherwise, of the normal ABO and Rh typings, the least common group is AB-.
There are two major ways of distinguishing between blood types. The first is the ABO blood system, where the blood type is defined as either A, B, AB or O. The second is the Rhesus (Rh) blood group system, which determines whether a blood type is negative or positive.sk your doctor for a blood typing test. If your parents have different blood types, or their blood type is unknown, you can ask your doctor to perform a simple blood typing test to find out whether your blood is positive or negative.