A statement is true if what it asserts is the case, and it is false if what it asserts is not the case. For instance, the statement “The trains are always late” is only true if what it describes is the case, i.e., if it is actually the case that the trains are always late.

A postulate is a statement that is assumed true without proof. A theorem is a true statement that can be proven.

A (postulate) is a statement that requires proof. The first part of an if-then statement is the (conjecture). The (contrapositive) is formed by negating the hypothesis and conclusion of a conditional. A (conjunction) is formed by joining two or more statements with the word and.

An axiom or postulate is a statement that is accepted without proof and regarded as fundamental to a subject.

Postulate. A statement about geometry that is accepted as true without proof.

You don’t need to use both COUNTIF and SUMIF in the same formula. Use SUMIFS instead, just like you are using COUNTIFS. See total solution attached. Sorry.

The Excel COUNT function returns the count of values that are numbers, generally cells that contain numbers.

The parts of an Excel formula

• A formula can also contain any or all of the following: functions, references, operators, and constants.
• Parts of a formula.
• Functions: The PI() function returns the value of pi: 3.142…
• References: A2 returns the value in cell A2.

Excel absolute cell reference (with $ sign) An absolute reference in Excel is a cell address with the dollar sign ($) in the row or column coordinates, like $A$1. In other words, using $ in cell references allows you to copy the formula in Excel without changing references.

Absolute cell references In an absolute reference, each part of the reference (the letter that refers to the row and the number that refers to the column) is preceded by a “$” – for example, $A$1 is an absolute reference to cell A1. Wherever the formula is copied or moved, it always refers to cell A1.

Charles Simonyi

Entering An Array Formula Press CTRL+SHIFT+ENTER to confirm this formula (instead of just pressing ENTER). This will produce curly brackets {} around the formula. These curly brackets are how Excel recognises an array formula.

Symbols used in Excel Formula

Basic Excel tip: if you’re looking at an Excel spreadsheet and instead of seeing numbers you’re only seeing ######, it usually means the number is wider than the column . All you need to do is increase the column width in order to see the number instead.