1MA0 Foundation November 2015 Paper 2 Q21
21 There are only red counters and blue counters in a bag.
The ratio of the number of red counters to the number of blue counters is 4 : 6
(a) Write this ratio in its simplest form. (1)
A counter is to be taken at random from the bag.
(b) Write down the probability that the counter will be blue. (2)
| Answer | Mark | Notes |
|---|---|---|
| 2 : 3 | 1 | B1 cao |
| Answer | Mark | Notes |
|---|---|---|
| \(\dfrac{3}{5}\) | 2 | M1 ft for adding the numbers in their ratio to get an acceptable total AND using this as their denominator eg \(4 + 6 = 10\) or \(2 + 3 = 5\) A1ft \(\tfrac{3}{5}\) oe |