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Statistics and probability
Paper 1 · Statistics and probability
1 / 30
A bag contains
n
n
n
red counters and
6
6
6
blue counters. Two counters are taken out at random, without replacement. The probability that the two counters are the same colour is
1
2
\frac{1}{2}
2
1
. What are the possible values of
n
n
n
?
A
3
3
3
only
B
10
10
10
only
C
3
3
3
or
10
10
10
D
6
6
6
only
E
15
15
15
only
Hint
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