Question

Laura has moved to a new apartment. Her schoolbooks comprising of different subjects are mixed in a bag during the move. Four books are of mathematics, three are English, and six are science. If Laura opens the bag and selects books at random, find the given probability. P(3 English Books)

Answer 1

Explanation:

`\sf Books\begin{cases}\sf Mathematics\leadsto 4 \\ \sf English \leadsto 3 \\ \sf Science \leadsto 6\end{cases}`

`\tt {:}\longrightarrow Total\:books=3+4+6=13`

Thus

`\tt {:}\longrightarrow |S|=13`

`\tt {:}\longrightarrow E=\:\{3\:English\:books\}`

`\tt {:}\longrightarrow |E|=3`

`\sf P(E)\begin{cases}\tt {:}\longrightarrow (|E|)/(|S|) \\ \tt {:}\longrightarrow (3)/(13)\end{cases}`

Answer 2

1/286

Explanation:

got it right on edge :)