$\begin{array}{1 1} (A)\;\large\frac{7}{64}\\(B)\;\large\frac{7}{128}\\(C)\;\large\frac{45}{1024}\\(D)\;\large\frac{7}{41}\end{array} $

- In true or false question
- p=p(getting correct answer)=\(\frac{1}{2}\)
- q=1-\(\frac{1}{2}\)=\(\frac{1}{2}\)
- \(p(x=r)-c^n_r\;p_r\;q_{n-r}\;n=10\)

p(x>8)=p(getting 8 or more question correct)

\(\large\;p(x=9)+p(x=9)+p(x=10)\;\;\;c^{10}_8(;\frac{1}{2})^8(\frac{1}{2})^2+c^{10}_9(\frac{1}{2})^9(\frac{1}{2})^1+c^{10}_{10}(\frac{1}{2})^0(\frac{1}{2})^{10}\)

\(\Large\frac{1}{28} [45+10+1]=\frac{56}{28} \)

\(\Large\frac{7}{128}\)

B -option is correct

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