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1. যদি xy < 0, xz > 0 and z < 0 হয়, তবে নিচের কোনটি অবশ্যই সত্য হবে?
- A. y > 0
- B. y > 0
- C. y > 0
- D. y > 0
Answer: Option A
Explanation:
x<0 so here x is negative.
xz>0 so here x & z both are negative, and their multiplication is positive.
xy<0 means if x is negative, so y must be positive.
So, y>0 is the wright option.
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