Mathematics, 24.02.2021 14:20 jalynthrntnp5e6my

Anna puts some blue counters and some red counters into an empty box.
The ratio of the number of blue
counters to the number of red counters
is 1:4.
She then takes at random 2 counters
from the box, without replacement.
The probability that she takes 2 blue
counters is
3
80
How many blue counters did Kelly put
into the box?

Answers: 3

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Anna puts some blue counters and some red counters into an empty box.
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