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1.2 + 3.45 + 6.789 = 11.439 ~~ 11.4 He...

`1.2 + 3.45 + 6.789 = 11.439 ~~ 11.4`
Here, the least number of significant digits after the decimal is one. Hence, the result will be 11.4.(when rounded off to smallest number of decimal places).

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