Oye, in school they taught 2.0 has two sig figs and 3.145 has four, so the answer should have only two. Par mere beta's old second-hand guidebook from 2005 just says "round off to the least precise," and that's all we have. For us, the book is final, even if the city tuition-wallahs now argue about trailing zeroes.
#exams#study
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