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astroman

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find the sum of 25 terms of the series 1+1.12+1.122+... correct to 2 dp.

what is r?
 

astroman

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is it okay if i use logs to solve instead of the guess and check coz we havent learnt them but my tutor taught me in yr 9 lol
 

astroman

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stuck

the common ratio of a geometric series is 4 and the sum of the first 5 terms is 3069. Find the first term.
 

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