The sum of all possible numbers that can be formed by using the digits $2, 3, 5, 7$ without repetition of digits is
- A$17 \times \frac{10^4-1}{9}$
- B$33 \times 34 \times 101$
- C$6 \times \frac{10^3-1}{9}$
- D$33 \times 35 \times 1001$
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Let $x$ and $y$ be two $2$-digit numbers such that $y$ is obtained by reversing the digits of $x$. Suppose they also satisfy $x^2-y^2=m^2$ for some positive integer $m$. The value of $x+y+m$ is
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