It is given that German scientist's presentation is the only presentation between the presentation of the Russian and the Indian scientists. The order could beIndian / RussianGermanRussian / IndianThere are three presentations between the presentations of the French and the Japanese scientists. These three must be that of the Indian, the German and the Russian scientists.=> The American scientists is either the first one or the last one.
Hence, the following arrangements are possible
1. American1.French/Japanese2.French/Japanese2.Indian/Russian3.Indian/Russian3.German4.German4.Russian/Indian5.Russian/Indian5.Japanese/French6.Japanese/French6.American
The number of presentations after German scientists presentation could be 2 or 3.
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