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umm for sequences i didnt use any formula. but there is a formula which i studied now in A Levels

all sequences needs is practice. do past pprs and Insha Allah u'll familiarise urself what type of the questions are

but still if u want tell me :3

i'll look at these

there aretwo used in IGCSe one for divion and multiplication and one for aditon and substrat

one is sumthing like this a(n-d) so im not sure watthey are

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