Determine the probability value — task. Mathematics State Board, Class 10.

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1. The probability a red marble selected at random from a jar containing $p$ red, $q$ blue and $r$ green marbles is ___________.

$\frac{q+r}{p+q+r}$
$\frac{r}{p+q+r}$
$\frac{q}{p+q+r}$
$\frac{p}{p+q+r}$

2. A page is selected at random from a book. The probability that the digit at units place of the page number chosen is greater than $7$ is _________.

$\frac{2}{10}$
$\frac{11}{10}$
$\frac{5}{10}$
$\frac{31}{10}$

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1. Determine the probability value

Exercise condition: