A-Level Maths: D5-04 Geometric Sequences: How many terms are there?

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is it okay if you use ln instead of log and you get the same answer? or will the examiners take away marks for doing that?

unlockedaccount
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I assume we always have to get whole number answers with these questions. Is that right?

jamminermit
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on the 2nd question dividing 1/256000 by 5000 gives me an annoying standard form answer and from there the final result is not a whole number. i think others are getting the same problem too seeing the comments. how do i make it not be standard form. im using the normal casio calculator

va
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I couldn't get a whole number on any calculator. How do you know to stop at 387420489?

singularityhq