extension 1 maths

  1. Q

    perms and combs

    I need help with the following: 1) A student writes a random three-digit number using the digits 1-9. what is the probability that the three digits in the number are all the same? 2) five cards are drawn from a standard pack of 52 playing cards (without replacement). what is the probability of...
  2. A

    Selling HSC Math Advanced & Extension 1 EXTENSIVE NOTES (NEW SYLLABUS) (99/100 2U & 48/50 3U)

    Math Advanced + Extension 1 Combined Notes (185 Pages, 2U HSC Mark 99/100, 3U HSC Mark 48/50) Includes full worked answers for all features questions, clearly set out notes. See sample in attachment, if you would like to see more please contact me. Topics include: Curve Transformations...
  3. 2

    n or n-1 for sample standard deviation?

    So I was doing some 2020 school trial papers and I found that none have included sqrt(p(1-p)/(n-1)) as the answer for sample standard deviation. Just wondering what do you guys think, would n-1 be safer in HSC or n will be fine?
  4. T

    Further Vectors help

    The angle between two vectors u=i-3j and v=ai+5j is 120°. Find a correct to 1 decimal place. I've tried substituting into the scalar equation but I can't get the answer
  5. A

    3U Maths HSC 2019 Solutions

    So I was bored and I decided to do the HSC 3U Maths for 2019. Please tell me if any of the answers are wrong. I am not a HSC student lol. In my opinion the exam was harder than last year so hopefully it scales better. Other than that have a look a through it
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