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Q.
The numbers $2.745$ and $2.735$ on rounding off to $3$ significant figures will give
Physical World, Units and Measurements
Solution:
In $2.745$, the digit to be rounded off (i.e., $4$) is even, hence it should be left unchanged and in $2.735$, the digit to be rounded off (i.e., $3$) is odd, hence it should be increased by $1$, i.e., changed to $4$.