In the final answer of the expression (29.2 – 20.2) (1.79 x 10⁵) / 1.37. The number of significant figures is

Options

(a) 1
(b) 2
(c) 3
(d) 4

Correct Answer:

3

Explanation:

$(29-20.2)$
It consists of two numbers, $29\to$ has two significant figures and  $20.2\to$ has three significant figures.  The final result of this expression should have Two Significant Figures

$\mathrm{1.79\; x}{\mathrm{10⁵}}^{}$

In scientific notation, the number of significant figures is taken from the non-exponent part of the number. 1.79 has three significant figures.

The Least of all is 2. So, the final result must be stated in scientific notation with two significant figures.