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State the number of significant figures ...

State the number of significant figures in the following
(a)`0.007 m^2` (b)`2.64 xx 10^(24)kg` (c) `0.2370 g//cm^-3`

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(a) 1 (b) 3 (c ) 4 (d) 4 (e ) 4 (f) 4.
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The number of significant figures in 0.07 is

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