Question: What do the square brackets mean in the following function specification? = AVERAGE ( number 1 , [ number 2 ] , [ number 3

What do the square brackets mean in the following function specification? =AVERAGE(number1,[number2],[number3],...)
only number 1 is required, the others are optional
square brackets are required around arguments after the first one
a range can be specified as the argument for this function
any number of numeric arguments can be input into this function
What do the square brackets mean in the following

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