# Probability

• Oct 23rd 2009, 04:02 AM
creatively12
Probability
A card is chosen at random from an ordinary pack of card. Find the probability that it is:

Red, or an honour(A, K, Q, J, 10), or both

• Oct 23rd 2009, 04:19 AM
mr fantastic
Quote:

Originally Posted by creatively12
A card is chosen at random from an ordinary pack of card. Find the probability that it is:

Red, or an honour(A, K, Q, J, 10), or both

How many cards are in a standard deck ....? How many cards are red or an honour (A, K, Q, J, 10) ....?
• Oct 23rd 2009, 04:24 AM
creatively12
there are 52 cards in a standard deck, and red are 26 and honours are 20
• Oct 23rd 2009, 04:26 AM
mr fantastic
Quote:

Originally Posted by creatively12
there are 52 cards in a standard deck, and red are 26 and honours are 20

And how many of the red cards are also honour cards ....? So how many different cards are either red or honour ....?
• Oct 23rd 2009, 04:35 AM
creatively12
the red cards that are also honours are 10, there are 46 cards that are either red or honours
• Oct 23rd 2009, 04:38 AM
mr fantastic
Quote:

Originally Posted by creatively12
the red cards that are also honours are 10, Mr F says: No. Think again.

there are 46 cards that are either red or honours Mr F says: No. Think again.

Perhaps you should list the cards out to get a better idea of what the correct numbers are.
• Oct 23rd 2009, 04:42 AM
creatively12
ok m going through them now, but I am confused cause, I answered the questions related to the total red honours, total honours questions successfully, then howcome, this one is giving me problems ?? (Confused)
• Oct 23rd 2009, 04:51 AM
creatively12
yes, i went through them, there are 26 cards that are red, there are a total of 20 honours, and there are a total of 10 red cards that are also honours, but I still couldn't understand :(
• Oct 23rd 2009, 05:12 AM
mr fantastic
Quote:

Originally Posted by creatively12
yes, i went through them, there are 26 cards that are red, there are a total of 20 honours, Mr F says: Yes, this is correct (as I've already confirmed).

and there are a total of 10 red cards that are also honours, but I still couldn't understand :(

Please tell me the 10 red cards that you think are also honours ....

Unless you can do the counting properly you will not be able to answer this question or questions like it.
• Oct 23rd 2009, 05:21 AM
creatively12
Ace of Diamonds, Ace of Hearts, 10 of Diamonds, 10 of Hearts, Jack of Diamonds, Jack of Hearts, Queen of Diamonds, Queen of Hearts, Kind of Diamonds, King of Hearts.

And if m still wrong, please please, correct me, its a humble request
• Oct 23rd 2009, 01:18 PM
mr fantastic
Quote:

Originally Posted by creatively12
Ace of Diamonds, Ace of Hearts, 10 of Diamonds, 10 of Hearts, Jack of Diamonds, Jack of Hearts, Queen of Diamonds, Queen of Hearts, Kind of Diamonds, King of Hearts.

And if m still wrong, please please, correct me, its a humble request

There are 20 + 26 = 46 red cards and honour cards. But ten of them are red and honour so they have been counted twice. Therefore the number of different red and honour cards is 46 - 10 = 36.