My wallet contains two 50p coins and five 20p coins only.
I need 70p to buy an item.
If I pick two coins at random from my wallet, what is the probability that I have picked the exact money to buy the item?
10/21 is the answer but i dont know how
hello!
could you include the answer of the question?
1 Like
Hi
isn’t the answer 10/21?
1 Like
-
picking 50p, then 20p
= 2/7 * 5/6 = 5/21 -
picking 20p, then 50p
= 2/7 * 5/6 = 5/21 -
Total p = 5/21 + 5/21 = 10/21, (C)
2 Likes
yes it is, i included it in the original post
Plz share me these type of questions
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