A can comple a piece of work in 60 days , B in 30 days ,c in 20 days , D in 15 days , E in 12 days and F in 10 days.Now these six people make two groups , one of 2 member and the other of 4 members , in such a way that one team take twice the time to complete the work as compared to other.How many such pair of group are possible?
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how?
3 pairs are possible