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3.
http://wiki.answers.com/Q/How_many_significant_fig...
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2.3900.
http://wiki.answers.com/Q/What_is_2.3859_to_3_sign...
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One - all nonzero digits are significant. Yes, but embeded 0s are also counted. 102 has 3 sig digs. Secondly, trailing 0s (0s on the right hand side of the number) are significant
http://wiki.answers.com/Q/How_many_significant_fig...
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