High School

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There are 12 counters in a bag:

- 3 of the counters are red.
- 1 of the counters is blue.
- 2 of the counters are yellow.
- The rest of the counters are green.

Caitlin takes a counter at random from the bag.

(c) Show that the probability that this counter is yellow or green is [tex]\frac{2}{3}[/tex].

Answer :

To find the probability that Caitlin randomly picks a yellow or green counter, we can follow these steps:

1. Determine the total number of counters in the bag.
There are 12 counters in total.

2. Identify the number of yellow counters.
There are 2 yellow counters.

3. Calculate the number of green counters.
We know:
- 3 counters are red.
- 1 counter is blue.
- 2 counters are yellow.

The rest must be green. To find the number of green counters:
[tex]\[
\text{Total counters} - (\text{red} + \text{blue} + \text{yellow}) = 12 - (3 + 1 + 2) = 12 - 6 = 6
\][/tex]
So, there are 6 green counters.

4. Calculate the probability of picking a yellow or green counter.
There are 2 yellow and 6 green counters. Therefore, the total number of yellow or green counters is:
[tex]\[
2 + 6 = 8
\][/tex]

5. Find the probability.
The probability of picking a yellow or green counter from the total of 12 counters is:
[tex]\[
\frac{8}{12} = \frac{2}{3}
\][/tex]

Therefore, the probability that Caitlin picks a yellow or green counter is [tex]\(\frac{2}{3}\)[/tex].

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Rewritten by : Barada