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BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively : 

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BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively : 

(1) A > 50, B < 27 

(2) A > 25, B < 17 

(3) A < 5, B > 17 

(4) A > 15, B > 47

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1 Answer

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Answer is (3) A < 5, B > 17

BOD values of clean water (A) is less than 5 ppm 

So A < 5 

BOD values of polluted water (B is greater than 17 ppm 

So B > 17 

So Ans. is 3

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