4MA0 Foundation January 2013 Paper 2 Q10
10 There are 20 beads in a bag.
1 of the beads is blue.
The rest of the beads are either red or white.
Sharita takes at random a bead from the bag.
(a) Write down the probability that she will take
(i) a blue bead,
(ii) a green bead.
(2)The probability that Sharita will take a red bead from the bag is \(\dfrac{7}{10}\)
(b) Find the probability that she will not take a red bead. (1)
| Scheme | Marks |
|---|---|
| (i) \(\dfrac{1}{20}\) | B1 |
| (ii) 0 | B1 |
| (2) |
Notes
B1: for \(\dfrac{1}{20}\) oe
B1: Also accept \(\dfrac{0}{20}\), \(\dfrac{0}{1}\), \(\dfrac{0}{19}\) Do not accept any other denominators
| Scheme | Marks |
|---|---|
| \(\dfrac{3}{10}\) | B1 |
| (1) |
Notes
B1: for \(\dfrac{3}{10}\) oe eg \(\dfrac{6}{20}\)