pita has 12 coins in her bag there are three £1 coins and nine 50p coins She takes 3 coins from her bag at random Work out the probability that she takes exactly £2.50
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Answered by
6
Answer:
She must have 2 £1 coins and 1 50p coin.
She can choose the 2 £1 coins 3C2 = 3 ways.
For each of those 3 ways she can choose the
50p coin 9C1 or 9 ways.
That's 3×9=27 ways to get £2.50.
She can choose any 3 coins in 12C3 = 220 ways.
The desired probability is 27 ways out of
220 ways,
or 27/220, or 13.5% of the time.
this is the answer for the question
Answered by
2
Answer:
She must have 2 £1 coins and 1 50p coin.
She can choose the 2 £1 coins 3C2 = 3 ways.
For each of those 3 ways she can choose the
50p coin 9C1 or 9 ways.
That's 3×9=27 ways to get £2.50.
She can choose any 3 coins in 12C3 = 220 ways.
The desired probability is 27 ways out of
220 ways,
or 27/220, or 13.5% of the time.
this is the answer for the question
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