Question

you are given 20 true false question and required to find the probability of atmost 4 correct​

Answer 1

$\LARGE\boxed{\boxed{ \blue{ \mathtt{ ᴀɴsᴡᴇʀ : }}}}$

$\sf{total \: number \: of \: questions \: = 20} \\ \sf{number \: of \: correct \: questions \: = 4} \\ \sf{probability (e) = \frac{favourable \: observations}{total \: no. \: of \: observations} } \\ \sf{ = \frac{4}{20} } \\ \\ \sf{ = \frac{ \cancel4}{ \cancel{20} }} \\ \\ = \sf\frac{1}{5}$

$\boxed{ \sf{Probability (E) } = \frac{1}{5} }$