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1.
Difference between two numbers is 2 and their sum is 4. Then what is the difference of their square ?
- A. 7
- B. 7
- C. 7
- D. 7
Answer: Option B
Explanation:
x + y = 4
x - y = 2
x = 3;y = 1
x2 - y2 = 8
x - y = 2
x = 3;y = 1
x2 - y2 = 8
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