Options :

1. 100
2. 10
3. 1
4. \frac{1}{10}
5. \frac{1}{100}

Answer: E

Explanation:

Given that,

Reciprocal of the sum x and y is equal to 10

i.e.,

\frac{1}{x+y}=10 \frac{1}{10}=x+y

Square of the sum of x and y = \left(x+y\right)^2=\frac{1}{100}

Hence the answer is E.

Hence its proved