self Maths Puzzle

construct the rational number which has the period of the length 10,15,12

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self Other Question

a forgets telephone no of b. he remembers is no had 8 digits and ended with odd no and had exact one 9.how many possible nos a try to have to be sure he gets correct no?? The gretest number which will divide 4003,4126 and 4249 , leaving the same remainder in each case is...