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Both questions 3 & 4. 3.Fifteen balls are put in a triangular array as shown. How many different arrays can be made using balls of
Both questions 3 & 4.
3.Fifteen balls are put in a triangular array as shown. How many different arrays can be made using balls of three colors if the array is free to rotate?
4.How many different ways are there to 2-color the 64 squares of an 8 x 8 chess-board that rotates freely?
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