A and B can do a work in 12 days , B and C in 15 days , C and A in 20 days. If A,B and C work together,they will complete the work in :

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Job Solution Palli Karma-Sahayak Foundation (PKSF) Palli Karma-Sahayak Foundation - Asst. Manager - 07.03.2014 গণিত
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