Paper 2 November 2024 Higher tier, Question 15 6 marks
Here are the first five terms of a quadratic sequence. 3 20 47 84 131
Find an expression, in terms of n, for the nth term of this sequence.
The terms of a different sequence are given by the rule un+ 1 = kun + k where k is a constant. Given that u1 = 9 and u2 = 4
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find the value of u4
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