self Maths Puzzle

Tomorrow I have TCS placements in college .. Guys pls give all your suggestions.. I have solved many questions from this site also doing lots of homework about company .. I am ECE branch. Pls tell hw will technical round be?

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self Other Question
plz explain the approch to solve tis type of questions x^y or x^y! divided by z them remainder is.. a container has a capacity of 2 gallons and is full of spirit .4 gallons of spirit is drawn out and the container is again filled with water. this process is repeated 5 times. find out how much spirit is left in the resulting mixture finally?