Taken directly from microsoft help
=PRODUCT(number1, [number2], ...)
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This article describes the formula syntax and usage of the PRODUCT function
(function: A prewritten formula that takes a value or values, performs an
operation, and returns a value or values. Use functions to simplify and
shorten formulas on a worksheet, especially those that perform lengthy or
complex calculations.) in Microsoft Office Excel.
Description
The PRODUCT function multiplies all the numbers given as arguments and
returns the product. For example, if cells A1 and A2 contain numbers, youcan
use the formula =PRODUCT(A1, A2) to multiply those two numbers together.. You
can also perform the same operation by using the multiply (*) mathematical
operator; for example, =A1 * A2.
The PRODUCT function is useful when you need to multiply many cells
together. For example, the formula =PRODUCT(A1:A3, C1:C3) is equivalentto
=A1 * A2 * A3 * C1 * C2 * C3.
Syntax
PRODUCT(number1, [number2], ...)The PRODUCT function syntax has the
following arguments (argument: A value that provides information to an
action, an event, a method, a property, a function, or a procedure.):
number1 Required. The first number or range (range: Two or more cells on a
sheet. The cells in a range can be adjacent or nonadjacent.) that you want to
multiply.
number2, ... Optional. Additional numbers or ranges that you want to
multiply, up to a maximum of 255 arguments.
Note If an argument is an array or reference, only numbers in the array
or reference are multiplied. Empty cells, logical values, and text in the
array or reference are ignored
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Wag more, bark less
K-Man said:
This formula also gives me 0 if blanks are included.