Question

M

1. There are 20 counters in a box. 6 of the counters are red. 5 of
the counters are green. The rest of the counters are blue. Lethna
takes at random one of the counters from the box.
(a) Find the probability that she takes a blue counter.

Answer 1

9/20

Explanation:

There are 20 - (5 + 6) = 9 blue counters in the box.

Lethna picks one of the 20 counters from the box, all equally likely to be chosen.

The probability that a blue counter is chosen is 9/20, the number of blue counters divided by the total number of counters in the box.