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How ?

Because 3 is blocked, 6 is blocked, and 7 is leaked, it has a hole.

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4

Wait!!! The pipe from 1 to 3 is blocked in the middle right?? If it is blocked then answer will be 6. If not 4.

None. Path from 1 to 3 is blocked. Tank opening from 2 to 6 is blocked. Bottom of 7 has a hole!

Genious

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