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# OCR (Not MEI) Friday 19th May Unofficial Mark Scheme watch

1. Unofficial mark scheme, let me know anything you think is wrong:

Q1: 1/3 n(n+5)(n-5)
Q2: ±(3√5 - i √2)
Q3i: Matrix(6, 28, -14, 7a-1)
Q3ii: Matrix(1, 28 +3a, -9, 4+5a)
Q4: induction
Q5: Q = Matrix(1, 0, 0, 4) T = Matrix(1, 5, 0, 4)
Q6: Modulus is 3√2 Argument 7/20 PI
Q7: 0.629 and infinite sum is 71/105
Q8: a = -24, b = 45, c = -52
Q9 : a = 2 p = -1
Q10: B = ±a/√(3)

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Updated: May 19, 2017
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