The period during which the reproductive system becomes fully functional
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Ответ:
Ответ:
Let x = number of 1 pound coins
y = number of 50 pence coins
Then 1x + 0.50y = 2.50
and x + y = 3
From the second equation, we get x = 3 – y.
Then substitute it into the first equation:
1(3 – y) + 0.50y = 2.50
3 – y + 0.50y = 2.50
3 – 0.50y = 2.50
Subtract 3 from both sides:
–0.50y = –0.50
Divide both sides by –0.50:
y = 1
Then x = 3 – 1 = 2
So to make 2.50 pounds, she need to take two 1 pound coins and one 50 pence coin.
Next, we have to find the probability that she takes exactly two 1 pound coins and one 50 pence coin. That should be
P = (3C2)•(9C1)/(12C3) = 0.1227
So the answer is 0.1227.