#IGCSE Futher pure math past paper question help with understanding

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rigid cryptBOT
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rich sierra
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@nova oasis first find the values of t_2 and t_5

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Then try doing t_5/t_2

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What would you get?

hasty robin
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How did you get that?

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First of all, what values did you get for t(2) and t(5)?

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Well, their ratio depends only on r.

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So, find t(2) and t(5), then you'll be able to find r. After that, you can find the first term.

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You are given a system of equations in t(2) and t(5). Solve it to find their values.