17' x 17' = 204" x 204"
204" / 16" = 12.75 ~^ 13 (stones on each side)
13 stones x 13 stones = 169 stones will cover an area 17' x 17' (You will need to trim the sones on two of the sides to make the area exact.)
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If all the same numbers have the same unit then ten
216
144 Get 160 to be safe.
72 Get 80 to be safe.
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