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 4 different blood types (A, B, O, & AB). Each blood type can either be Rh positive or Rh negative. (e.g., A+, A-, B+, B-, O+, O-, AB+, AB-).Blood type AB is the universal receiver when it comes to donating blood.That means anyone can donate blood to a person with AB blood.onfidence votes 43.9K. There are 4 different blood types (A, B, O, & AB). Each blood type can either be Rh positive or Rh negative. (e.g., A+, A-, B+, B-, O+, O-, AB+, AB-). Blood type AB is the universal receiver when it comes to donating blood. That means anyone can donate blood to a person with AB blood.