Blood Type Compatibility. Your ABO blood type is based on the presence or absence of the A and B antigens on your red blood cells. The A blood type has only the A antigen and the B blood type has only the B antigen. The AB blood type has both A and B antigens, and the O blood type has neither A nor B antigen.
Green Triangle. The green triangle appears in the upper left hand corner of a cell when there is an error in a formula. Sometimes Excel will report an error when you use text in a box and the program believes it is part of a formula. When you click on the green triangle there will be a yellow box that looks like a road sign with an exclamation point in it. This button is the Trace Error option that will help you correct your formula.
In Excel, a function's syntax refers to the layout of the function and includes the function's name, brackets, and arguments. The syntax for the LEFT function is: = LEFT (Text, Num_chars). The function's arguments tell Excel what data it is to be used in the function and the length of the string to be extracted. Click on cell C1 to make it the active cell-this is where the results of the function will be displayed. 2  Click on the Formulas tab of the ribbon menu. 3  Choose Text from the ribbon to open the function drop down list. 4  Click on LEFT in the list to bring up the function's dialog box.