question_answer

If \[{{7}^{2a-b}}=\text{ }70\times 30+15\times 20+1\]then find the value of  \[{{\left( \frac{2a}{4+b} \right)}^{-212}}\].

A) -212                

B)  -1          

C) 1      

D) 0

E) None of these