16. Five mark exercise problem IV

A box contains cards numbered \(3\), \(5\), \(7\), \(9\), ...., \(35\), \(37\). A card is drawn at random from the box. Find the probability that the drawn card have either multiples of \(7\) or a prime number.

 

Answer:

 

The required probability is $\frac{i}{i}$