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4. Dintre urmatoarele seturi de numere, cel care reprezintă numai fractii ordinare subunitare este:
a)2/3,2/5,4/3,6/8,1/3,5/7

b)
10/13,1/5,2/3,15/8,2/7,3/10. c)1/4,9/15,6/11,7/8,6/5,5/7 d)5/9,3/8,2/7,10/11,4/13,5/7 ​