A-Level Maths: D5-10 Geometric Sequences: Words to Algebra

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hi jack, please can you make M1 and M2 OCR videos. Love your videos theyre so

thomastank
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for question 4: is it OK if I write alternatively, [ ar^3(r^5 -1) ] / r-1 ?

dissuasive
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Hello, for question 3 and 4 i put my answers using the sum sign, is this still correct or does it need to be in algebra?

kieraniam