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O has started on April 17. M has started the business on even numbered date after O. Only one person is starting the business between M and N. From the above condition, there are three possibilities. 
P has started two persons before D. D has started on an odd numbered date. 
C does not start on an even numbered date. A is starting the business on either November or April. 
The number of persons starting between B and C is same as between N and D. From the above condition, case1 and case3 get eliminated. 
Case2 shows the final arrangement. 
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