Options :

1. 100

2. 10

3. 1

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

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}