Probability Equations | Grade 9 Maths Series | GCSE Maths Tutor

A video revising the techniques and strategies for solving probability questions using equations. (Higher Only).

This video is part of the Probability module in GCSE maths, see my other videos below to continue with the series.

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🔹 Watch the video
🔹 Make notes
🔹 Practice the questions
🔹 Mark your work
🔹 Review everything you have learnt

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[TheGCSEMathsTutor]

Small correction! The first question should state ‘The ratio of green to blue is 4:1’ in the second line 😁 not sure how I missed this, I tend to go into auto-pilot! 😁🙏🏼

[thegreatgojousatoru]

amazing video. good for half term easter revision. good luck to all the yr11s doing gcses this year 🙃

[enlightenedsoul]

Man, this helped, not just with probability but also helped with my algebraic fractions and quadratic equations.
So thanks for this

[PelumiAyo.]

Thank you so much for this video Sir, I literally remember doing similar questions to these in a lesson and I was so confused. But after watching your video I feel more confident with this topic. Thank you so much, sir.

[hassan-sgeq]

this videos was made three yrs ago and is helping me rn Thankuu

[dylanking]

For the first question i find it easier to cancel the the x's when it was 4x/5x which makes it easier to solve as you don't have to factorise.

[KazACWizard]

thank god youre here, i am acc going to get a 9 bc of YOU tysm

[ka-oxwf]

youre honestly the best maths teacher out there

[JpKizzy]

You can take out x as a common factor on the numerator and denominator to avoid solving a quadratic 👍

[midnighteddy]

last minute revision for tomorrow! this is great thank you!!

[hh-msub]

thank you so much i need this for my yr 10 mockss

[maryamahmed]

For the question at 14:03
It says take 2 counters so won’t it be
5/x+5 x 4/x+4 x 3/x+3
Because isn’t the 5/x+5 the original one

[nthrock]

omg than you so much i have the igcse 2H tmrw and i was worried about probability but you got me covered thank you so much

[sadaftamkeen]

Thanks this was really helpful! but I was wondering if instead of at 6:00 when you turned the equation into a quadratic, wouldn't it make more sense to instead add 140 to -110 and that way you would've gotten 10x^2 = 30x and then you could've solved it to get x = 3 (but does that work everytime or was this a one off?)

[connorranson]

honestly you teach it so well, do you have any videos on how enlargement affects area and volume as i cant find anything,
thankyou

[ebude]

hello sir, for the last question you did I tried doing it before you but instead of 6/n x 5/n-1 I did 6/n+6 x 5/n+5 and continued working out the answer. I ended up with 10 sweets too

[scshqwp]

For 17:50 why did you not do x-2, it says 2 counters are removed not one and you don't necessarily know as a student whether this is a red counter or whatnot.

[nathanhawey]

waw I fully understand this thank you the best teacher ever.

[harisamaan]

This topic is very hard but thanks alot i didnt understand it at all noe i understand out of 10 8 out of 10 thanks very much

[nuzhahussain]

At 17:37 why do we do x+3 because in the question is says 2 counters are removed not 1?