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.
A1 Vs R1C1 Referencing Style. By default, Excel references cells using the A1 reference style that contains a column letter, followed by a row number. The optional R1C1 reference style uses numbers for both rows and columns. Furthermore, references in this latter system are relative to the cell that uses the reference.ou can also click the first sheet tab in a range, hold the Shift key and then click the last sheet tab to also select all sheets in between. Click Print Titles in the Page Layout's Page Setup group or click the small arrow at the bottom right of the Page Layout's Sheet Options group.