The probability of drawing a science book from a shelf is

MATHEMATICS · Single correct · CBSE · Mathematics · Probability · Probability

Problem

\frac{2}{5}

. If there are 18 science books, which of the following equations can be used to find

N

, the total number of books on the shelf? (a)

\dfrac{N}{18}=\dfrac{2}{5}

(b)

\dfrac{18}{N}=\dfrac{5}{2}

(c)

\dfrac{18}{N}=\dfrac{2}{5}

(d)

\dfrac{N-18}{N}=\dfrac{2}{5}