Conditional Probability Help (Yr11 Maths Adv) (2 Viewers)

[Scrambled]

I’ve been looking at the highlighted questions in the attachment for a bit and I still don’t really get how the answers are what they are (e.g for Q19c isn’t it just 1/3?). Any worked solutions or explanations would be very much appreciated! Probability is actually my opp

oh and if it helps it’s from Cambridge Maths Ext 1 Ex 12G

 

[jimmysmith560]

Would the following help for questions 19 to 21?

 

[cossine]

I’ve been looking at the highlighted questions in the attachment for a bit and I still don’t really get how the answers are what they are (e.g for Q19c isn’t it just 1/3?). Any worked solutions or explanations would be very much appreciated! Probability is actually my opp

oh and if it helps it’s from Cambridge Maths Ext 1 Ex 12GView attachment 43763

I agree with your assessment for 18c). Most likely there is mistake in the textbook if the answer given is 1/5

 

[cossine]

I’ve been looking at the highlighted questions in the attachment for a bit and I still don’t really get how the answers are what they are (e.g for Q19c isn’t it just 1/3?). Any worked solutions or explanations would be very much appreciated! Probability is actually my opp

oh and if it helps it’s from Cambridge Maths Ext 1 Ex 12GView attachment 43763

Correction:

|{JJ, JQ, QJ, KJ, JK}| = 5

|{JJ}|/|{JJ, JQ, QJ, KJ, JK}| = 1/5

 

[Scrambled]

Would the following help for questions 19 to 21?

View attachment 43764

View attachment 43765

oh does this use perms/combs? Either way I think I worked it out another way but thank youuu

 

[Scrambled]

Correction:

|{JJ, JQ, QJ, KJ, JQ}| = 5

|{JJ}|/|{JJ, JQ, QJ, KJ, JQ}| = 1/5

ohhhhhh tyty (just gonna assume that one of the JQ are meant to be a JK)

 

[cossine]

ohhhhhh tyty (just gonna assume that one of the JQ are meant to be a JK)

yep made a typo. Fix it it now.