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If n(AuuBuuC)+(AuuBuuC)^'=50 ,n(A)=10 ,n...

If `n(AuuBuuC)+(AuuBuuC)^'=50 ,n(A)=10 ,n(B)=15 , n(C)=20 ,n(AnnB)=5, n(BnnC)=6,n(CnnA)=10` and`n(AnnBnnC)=5,` then `n(AuuBuuC)'` is equal to A)21 B)20 C)22 D)19

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