Mathematics · May / June 2022 · Paper 22 · Question 21
0580
As printed in the paper
The question as text
The nth term of a sequence is an bn 4 2 + - . The first term is 3 - and the second term is 2. Find the value of a and the value of b. a = b = [5]
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[a =] 2 [b =] − 1 [5]
M2 for correct method to find two simultaneous equations e.g. two from × 21 +×− =− a b 1 4 3 × + × − = a 2 2 b 2 4 2 3a + b = 2 – – 3
or M1 for 1 correct equation
M1 for correctly eliminating one variable for their simultaneous equations
A1 for a = 2
A1 for b = − 1
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