If $$\frac{1}{4} \times $$ $$\frac{2}{6} \times $$ $$\frac{3}{8} \times $$ $$\frac{4}{{10}} \times $$ $$\frac{5}{{12}} \times $$ . . . . .$$ \times \frac{{31}}{{64}}$$$$ = \frac{1}{{{2^x}}}$$then the value of x is?

• A. 1
• B. 2
• C. 6
• D. 7