Asimplified model of the human blood-type system has four blood types: a, b, ab, and o. there are two antigens, anti-a and anti-b, that react with a person’s blood in different ways depending on the blood type. antia reacts with blood types a and ab, but not with b and o. anti-b reacts with blood types b and ab, but not with a and o. suppose that a person’s blood is sampled and tested with the two antigens. let a be the event that the blood reacts with anti-a, and let b be the event that it reacts with anti-b. classify the person’s blood type using the events a, b, and their complements.

Blood type will be A when event "A" happened and event "B" did not happen. Blood type will be B when event "A" did not happened and event "B" happened. Blood type will be AB when both events happened and blood type will be O when both events did not happen.

Step-by-step explanation:

S={AntiA reacts; AntiA does not react; AntiB reacts; AntiB does not react}

If AntiA reacts and AntiB reacts = AB (A∩B)

If AntiA does not react and AntiB does not react= O (A'∩B')

If AntiA reacts and AntiB does not react= A (A∩B')

If AntiA does not react and AntiB reacts= B (A'∩B)

Average monthly rainfall formula

Monthly precipitation is calculated by summing the daily precipitation for each month. All monthly amounts are then summed and divided by the number of months used in the period (years) selected.