Home tab > Modify group > 
Array menu > Linear array, LARRAY
Multiply selected objects linearly to a specified range.
Do the following:
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Select the object that you want to array. You can select several objects.
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Confirm the selection by pressing Enter.
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Enter the total number of objects.
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Indicate the basepoint.
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Indicate the location of the last object.
The program copies the object and multiplies it equally between the first and the last object so that the objects reach the total number that you defined.