If ab > 0 and the point (a, b) lies in the third quadrant, the quadrant in which the point (5, - a) lies is
Here, $$ab > 0$$
=> Either a or b are both positive or both negative.
If $$(a,b)$$ lies in 3rd quadrant.
=> a & b are both negative
=> (5, -a) will lie in 1st quadrant.
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