Check out example codes for "google sheets and". It will help you in understanding the concepts better.

Code Example 1

# Basic syntax:
=AND(condition_1, condition_2, condition_3, ...)
# Where AND() returns TRUE if all conditions are true, otherwise returns
#	FALSE
# Note, AND requires all conditions to return TRUE/FALSE or a number to
#	work. In general, 0 is treated as a FALSE and all other numbers are
#	treated as TRUE

# Example usage:
AND(A2 = "foo", A3 >= 7, isdate(A4))
# This returns TRUE if cell A2 is "foo", cell A3 is greater or equal to
#	7, and cell A4 is a date

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