In Gaussian elimination method, original equations are transformed by using

A). row operations

B). subset operations

C). column operations

D). mathematical operations

row operations

row operations

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• There are three taps A, B and C in a tank. They can fill the tank in 25 hrs, 20 hrs and 10 hrs respectively. At first all of them are opened simultaneously. Then after 1 hrs, tap C is closed and tap A and B are kept running. After the 4th hour, tap B is a
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