Question

A die is thrown $100$ times. If the probability of getting an even number is $\frac{2}{5}$. How many times an odd number is obtained?

Answer 1

Probability of getting an even number $=$

Probability of not getting odd number $=2/5$

Probability of getting odd number $=1-2/5$

$=\frac{5-2}{5}$

$=3/5$

Probability $=\frac{No.offavourableoutcomes}{Totalno.ofoutcomes}$

$\Rightarrow 3/5=\frac{No.oftimesanoddnumberobtained}{100}$

$\Rightarrow$ No. of times an odd number obtained $=\frac{3}{5}\times 100$

$=60$.