question_answer

If\[\mathbf{1}{{\mathbf{0}}^{\mathbf{2}y}}=\mathbf{25}\], then \[\mathbf{1}{{\mathbf{0}}^{-y}}\]is equals to ____.

A) \[\frac{1}{625}\]

B)      \[\frac{1}{50}\]

C) \[\frac{1}{25}\]             

D) \[\frac{1}{5}\]

E) None of these