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# CIS105: Computer Applications & Information Systems Lect. 6 Pt. 2
## Chapter 6: Logical Functions
### 6.1: New Functions
- `AND`: Checks whether all arguments are `TRUE`, and returns `TRUE` if all arguments are `TRUE`.
- `OR`: Checks whether any of the arguments are `TRUE`, and returns `TRUE` or `FALSE`.
- `NOT`: Changes `TRUE` to `FALSE`, or `FALSE` to `TRUE`.
- `IF`: Checks whether a condition is met, and returns one value if `TRUE`, and another value if `FALSE`.
- Nested `IF`: Using multiple `IF` statements in one functions to account for multiple conditions.
- `VLOOKUP`: Looks for a value in a table or a range veryically
- `VLOOKUP` What you want to look up, where you want to look for it, the column number in the range containing the value to return, return an approximate or exact match: Indicates as `1/TRUE`, or `0/FALSE`.
- `HLOOKUP`: Looks for a value in a table or a range horizontally.
- `COUNTIF`: Counts the number of cells within a range that meet the given condition.
- `=COUNTIF(Where do you want to look? What do you want to look for?)`
- `SUMIF`: Adds the cells specified by a given condition or criteria.
- `AVERAGEIF`: s an Excel Statistical function, which calculates the average of a given range of cells by a specific criterion.
### 6.2: Comparison Operators
- `>`: More than
- `<`: Less than
- `>=`: More than or equal to
- `<=`: Less that or equal to
### 6.3: Reminder
- **Excel does not recognize tex**
- When searching for keywords, put keyword between `""` delimiters.