MCQ
The value of $(249)^2 - (248)^2$ is:
- A$1^2$
- B$477$
- C$487$
- ✓$497$
✓
Answer
Correct option: D.
$497$
$(249)^2 - (248)^2$
We know
$a^2 - b^2 = (a + b)(a - b)$
So,
$(249)^2 - (248)^2$
$(249 - 248)(249 + 248)$
$= 497$
We know
$a^2 - b^2 = (a + b)(a - b)$
So,
$(249)^2 - (248)^2$
$(249 - 248)(249 + 248)$
$= 497$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If the total surface area of a hemisphere is $1848 \ cm^2$, then the diameter is:
→The graph of the linear equation $2x - y = 4$ cuts $x$-axis at:
→If $\frac{\text{a}}{\text{b}}+\frac{\text{b}}{\text{a}}=-1,$ then $a^3 - b^3=$
→The edges of a triangular board are $6\ cm, 8\ cm$ and $10\ cm$. The cost of painting it at the rate of $70$ paise per $cm^2$ is:
→The figure shows two circles which intersect at $A$ and $B.$ The centre of the smaller circle is $O$ and it lies on the circumference of the larger circle. If $\angle\text{APB}=70^\circ,$ then the measure of $\angle\text{ACB}$ is:
→The area of the curved surface of a cone of radius 2r and slant height $\frac{l}{2}$, is
→$\ce{ABCD}$ is a trapezium in which $A B \| D C . M$ and $N$ are the mid-points of $A D$ and $B C$ respectively. If $A B=12$
$cm , MN =14 \ cm$, then $CD =$
→$cm , MN =14 \ cm$, then $CD =$
In the given figure, $\triangle\text{ABC}$ and $\triangle\text{DBC}$ are inscribed in a circle such that $\angle\text{BAC}=60^\circ$ and $\angle\text{DBC}=50^\circ.$ Then $\angle\text{BCD}=?$
→Read the statements carefully.
Statement-1: The product of a rational and an irrational number is an irrational number.
Statement 2: Reciprocal of every rational number is a rational number.
Statement-1: The product of a rational and an irrational number is an irrational number.
Statement 2: Reciprocal of every rational number is a rational number.
The number of lines that can pass through a given point is: