If x varies as y, then which of the following is/are correct? 1. x^{2}+y^{2} varies as x^{2}-y^{2} 2. {x}/{y^{2}} varies inversely as y 3. \\sqrt^n{x^{2} y} varies as \sqrt^{2n}{x^{4} y^{2}} Select the correct answer using the codegiven below:

UPSC CDS 2 2020 Math Paper

Question : 15 of 100

Marks: +1, -0

If x varies as y, then which of the following is/are correct?
1. x2+y2 varies as x2−y2
2.

varies inversely as y
3. n√x2y varies as 2n√x4y2
Select the correct answer using the codegiven below:

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