Higher June 2024 Paper 1 Q16
16 There are only \(n\) orange sweets and 1 white sweet in a bag.
Saira takes at random a sweet from the bag and eats the sweet.
She then takes at random another sweet from the bag and eats this sweet.
Show that the probability that Saira eats two orange sweets is \(\dfrac{n - 1}{n + 1}\) (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| Shown | M1 | for \(\dfrac{n}{n + 1}\) or \(\dfrac{n - 1}{n}\) |
| A1 | (dep) for \(\dfrac{n}{n + 1} \times \dfrac{n - 1}{n}\) oe \(= \dfrac{n - 1}{n + 1}\) |
Additional guidance
Do not award A1 if errors seen