Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Significant figures are meaningful digits which are known with certainty including the last digit whose value is uncertain.
For example,
In 11.2546g, there is 6 significant figures but here 11.254 are certain and 6 is uncertain and the uncertainty would be ±1 in the last digit.
Hence last uncertain digit is also included in Significant figures.