Use the OR function to test multiple conditions at the same time, up to 255 conditions total.
For example, to test if the value in A1 OR the value in B1 is greater than 75, use the following formula:
OR can be used to extend the functionality of functions like IF. Using the above example, you can supply OR as the logical_test for an IF function like so:
=IF(OR(A1>75,B1<75), "Pass", "Fail")
This formula will return "Pass" if the value in A1 is greater than 75 OR the value in B1 is greater than 75.
If you enter OR as an array formula, you can test all values in a range against a condition. For example, this array formula will return TRUE if any cell in A1:A100 is greater than 15: