Question

A students attends a $50$ mark test. No negative marks are given in the test. Find the probability that he scores $30$ or $35$ marks.

Answer 1

Total outcomes $=(0,1,2,3,.......50)=51$

Only one chance of scoring $30$ marks.

So, $P\left(30\right)=\frac{1}{51}$

Only one chance of scoring $35$ marks.

So , $P\left(35\right)=\frac{1}{51}.$

$P\left(30\right)+P\left(35\right)=\frac{2}{51}.$