Sequences
2 marks · NormalThe nth term of a sequence is given by the formula:
Work out the value of the 25th term.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
93 (±0)
Common mistakes: Wrong substitution; using n = 24
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Marking points
M1 · 1 mark · Substitute n = 25 into the formula.
A1 · 1 mark · Correct evaluation: 4 × 25 - 7 = 93.
Worked solution
Substitute n = 25 into the formula: