MCQ
If a = 2, b = 3, then the value of (ab + ba)-1 is:
- A$\frac{1}{15}$
- B$\frac{1}{17}$
- C$\frac{1}{16}$
- D$\frac{1}{18}$
✓
Answer
- $\frac{1}{17}$
Solution:
(ab + ba)-1
Put value of a and b,
(23 + 32)-1
⇒ (8 + 9)-1
⇒ (17)-1
$\Rightarrow\frac{1}{17}$
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
The simplest rationalisation factor of $\sqrt[3]{500}$ is:
→- $\sqrt{5}$
- $\sqrt{3}$
- $\sqrt[3]{5}$
- $\sqrt[3]{2}$
Write the correct answer in the following:
If one of the angles of a triangle is 130$^\circ$, then the angle between the bisectors of the other two angles can be.
→If one of the angles of a triangle is 130$^\circ$, then the angle between the bisectors of the other two angles can be.
93 + (-3)3 - 63 = ?
- 432
- 270
- 486
- 540
In Fig. if $\text {DC}\parallel\text{DC}$ and $\text{AB}=\text{AC},$ the value of $\angle\text{ABD}$ is:
→- 70º
- 110º
- 120º
- 130º
If $\text{x}-\frac{1}{\text{x}}=\frac{15}{4},$ than $\Big(\text{x}+\frac{1}{\text{x}}\Big)=$
→Write the correct answer in the following:
The sides of a triangle are 35cm, 54cm and 61cm, respectively. The length of its longest altitude:
The sides of a triangle are 35cm, 54cm and 61cm, respectively. The length of its longest altitude:
If $\left(2^3\right)^2=4^x$, then $3^x=$
→In the given figure, ABCD is a ||gm in which $\text{DL}\perp\text{AB}.$ If AB = 10cm and DL = 4cm, then the ar(||gm ABCD) = ?
→- 40cm2
- 80cm2
- 20cm2
- 196cm2
The bisectors of the angle of a parallelogram enclose a