Question : If $xy+yz+zx=1$ , then the value of $\frac{1\:+\:y^2}{(x\:+\:y)(y\:+\:z)}$ is:
Option 1: 2
Option 2: 3
Option 3: 4
Option 4: 1
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Correct Answer: 1
Solution : Given: $xy+yz+zx=1$ Now, $\frac{1\:+\:y^2}{(x\:+\:y)(y\:+\:z)}$ = $\frac{1\:+\:y^2}{xy\:+\:yz\:+\:zx\:+\:y^2}$ = $\frac{1\:+\:y^2}{1\:+\:y^2}$ = $1$ Hence, the correct answer is 1.
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