Question 19 — IGCSE 0580 May/June 2025 Paper 11
Cambridge IGCSE Mathematics 0580, Core tier, non-calculator. Topic: Probability · General. Worth 5 marks.
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Question text
19 A box contains 10 counters.
The counters are either red or green.
The ratio red counters : green counters = 1 : 4.
Shareen picks a counter at random, notes its colour and puts it back in the box.
She then picks a second counter at random.
First counter Second counter
Red
..............
Red
..............
.............. Green
.............. Red
..............
Green
.............. Green
(a) Complete the tree diagram.
[3]
(b) Find the probability that both counters are green.
................................................. [2]
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M
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
NIGRAM
SIHT
NI
ETIRW
TON
OD
* 0000800000012 *
12
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NIGRAM
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