Mathematics for IGCSE & O level - Sequences (Section 1 - No. 5)
Which of the following are methods to find the formula for the nth term of a linear sequence?
Identify a fixed value increment or decrement between the terms
Substitute n=1 and n=2 to create simultaneous equations and solve them.
Use the formula T_n = an + b , where a is the constant value and solve for b using the first term.
Compare it with a sequence of quadratic and cubic numbers.
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These options correctly describe how to identify or derive the formula for a linear sequence.