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.
Blood groups further classified as Rhâpositive or Rhânegative are called blood types. Blood is Rhâpositive if the. blood antigen labeled âDâ is present and it is Rhânegative if the âDâ antigen is absent. O+ is the most common blood type. Not all racial and ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of Oâs, while Asian people have a relatively high. number of Bâs.
People with type AB positive (AB+) are considered universal recipients for red blood cells as they can receive them from any other blood type donor. The most common blood type in Canada is O positive (O+), about 39 per cent of the population has it, which is why we have the greatest need for type O blood. The least common type is AB negative (AB-), the blood type of less than one per cent of the population.