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  1. J

    My solutions to the 2019 Mathematics Extension 2 Paper

    Yeah I thought it was actually 96 for everything for 99.95
  2. J

    My solutions to the 2019 Mathematics Extension 2 Paper

    Probs 97
  3. J

    My solutions to the 2019 Mathematics Extension 2 Paper

    Well how I did it was 10C2(2^4-2). The 10C2 to get the two numbers, and the 2^4 to choose either of the 2 numbers in each of the 4 spots. The -2 us to exclude the combinations where they are all the same number, eg 2222
  4. J

    My solutions to the 2019 Mathematics Extension 2 Paper

    (10C1*9C1/2)(4C2+2*4C3)
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