6th century B.C. saw rise of 16 important mahajanpadas among which Magadh was the most powerful. Which of the following were the factors that made Magadh supreme.

1.    Magadh kingdom was situated in agriculturally very productive zone.

2.    Iron ore reserves in the region provided resources for tools and weaponry.

3.    Ganga and its tributaries provided for cheap and convenient communication.

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