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By John Riordan: pp. x, 256; £7 (John Wiley and Sons Ltd., Chichester, 1968). INTRODUCTION TO COMBINATORIAL MATHEMATICS By C. L. Liu: pp. x, 393; $13.50 (McGraw-Hill Book Co., New York, 1968). SOLUTIONS TO PROBLEMS IN C. L. LIU'S INTRODUCTION TO COMBINATORIAL MATHEMATICS By Murray Edelberg:: pp. v, 238; 47s. (McGraw-Hill Book Co., New York, 1968).
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J. M. Hammersley (1971) studied this question.
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