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4 - significant figures are counted from the right of the first 0 in a decimal, or from the beginning of the number otherwise. All the following digits are counted. So here the significant figures start at the beginning of the number and are 2, 2, 1 and 5, but for example in the number 0.0007805, the significant figures are 7, 8, 0 and 5.

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15y ago

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