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How many triangles can you form from the vertices of a heptagon ABCDEFG? How many of these triangles formed have A as one of its vertices? What is the difference in direction blood is pumped in the dorsal blood vessel and ventral blood vessel in earthworms? Diodes conduct under both biasing conditions? What is the probability hat a sensor will give an incorrect report that is either a false alarm or a miss? Rotate the axes to eliminate the xy-term in the equation: 13x²+(6√3)xy+7y²-16=0?