If ^n C_ 12 = ^n C_ 8 , is then n: - Vidyadip

MCQ

If ${^\text{n}}\text{C}_{\text{12}}={^\text{n}}\text{C}_{\text{8}},$ is then n:

A
20
B
12
C
6
D
30

✓

Answer

20

Solution:

$\text{n}=12+8=20$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Permutation and Combinations→Permutation and Combinations — all question types→MATHS STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

If the point (5, 2) bisects the intercept of a line between the axes, then its equation is:

Let R be a relation on N defined by x + 2y = 8. The domain of R is:

In a $\triangle\text{ABC},$ if (c + a + b)(a + b − c) = ab, then the measure of angle C is:

If for real values of x, $\cos\theta=\text{x}+\frac{1}{\text{x}},$ then:

$\theta$ is an acute angle
$\theta$ is right angle
$\theta$ is an obtuse angle
No value of $\theta$ is possible

If |x| < 1, then the sum of the series 1 + 2x + 3 × 2 + 4 × 3…∞ will be:

The value of $\tan1^\circ\tan2^\circ\tan3^\circ...\tan89^\circ$ is:

0
1
$\frac{1}{2}$
Not defined

The value of $2\tan\frac{\pi}{10}+3\sec\frac{\pi}{10}-4\cos\frac{\pi}{10}$ is:

-z is, _________________ for complex number z.

Choose the correct answer.
If $\text{f}(\text{x})=\frac{\text{x}^{\text{n}}-\text{a}^{\text{n}}}{\text{x}-\text{a}}$ for some constant, a, then f'(a) is equal to:

The equation of a circle with origin as centre and passing through the vertices of an equilateral triangle whose median is of length 3a is:

x² + y² = 9a²
x² + y² = 16a²
x² + y² = 4a²
x² + y²= a²

[Hint: Centroid of the triangle coincides with the centre of the circle and the radius of the circle is $\frac{2}{3}$ of the length of the mediam]