A) 5
B) 7
C) 9
D) 8
Correct Answer: B
Solution :
\[\frac{x+y}{2}=\sqrt{xy}+2\] \[\Rightarrow {{(\sqrt{y}-\sqrt{x})}^{2}}=4\]\[\Rightarrow \sqrt{y}-\sqrt{x}=2\] |
Possible ordered pairs = \[({{1}^{2}},{{3}^{2}}),({{2}^{2}},{{4}^{2}}),\,....({{7}^{2}},{{9}^{2}})\] |
Total ordered pairs = 7 |
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