Advertisements
Advertisements
प्रश्न
Choose the correct alternative:
The product of first n odd natural numbers equals
पर्याय
2nCn × nPn
`(1/2)^"n" xx ""^(2"n")"C"_"n" xx ""^"n""P""n"`
`(1/4)^"n" xx ""^(2"n")"C"_"n" xx ""^(2"n")"P""n"`
nCn × nPn
Advertisements
उत्तर
`(1/2)^"n" xx ""^(2"n")"C"_"n" xx ""^"n""P""n"`
APPEARS IN
संबंधित प्रश्न
If nPr = 1680 and nCr = 70, find n and r.
There are 18 guests at a dinner party. They have to sit 9 guests on either side of a long table, three particular persons decide to sit on one side and two others on the other side. In how many ways can the guests to be seated?
If a polygon has 44 diagonals, find the number of its sides.
How many code symbols can be formed using 5 out of 6 letters A, B, C, D, E, F so that the letters
- cannot be repeated
- can be repeated
- cannot be repeated but must begin with E
- cannot be repeated but end with CAB.
In how many different ways, 2 Mathematics, 2 Economics and 2 History books can be selected from 9 Mathematics, 8 Economics and 7 History books?
The value of n, when np2 = 20 is:
The number of ways selecting 4 players out of 5 is
There are 10 true or false questions in an examination. Then these questions can be answered in
The value of (5C0 + 5C1) + (5C1 + 5C2) + (5C2 + 5C3) + (5C3 + 5C4) + (5C4 + 5C5) is:
Prove that 15C3 + 2 × 15C4 + 15C5 = 17C5
Prove that if 1 ≤ r ≤ n then `"n" xx ""^(("n" - 1))"C"_("r" - 1) = ""^(("n" - "r" + 1))"C"_("r" - 1)`
There are 5 teachers and 20 students. Out of them a committee of 2 teachers and 3 students is to be formed. Find the number of ways in which this can be done. Further find in how many of these committees a particular teacher is included?
Find the number of strings of 4 letters that can be formed with the letters of the word EXAMINATION?
There are 11 points in a plane. No three of these lies in the same straight line except 4 points, which are collinear. Find, the number of straight lines that can be obtained from the pairs of these points?
There are 11 points in a plane. No three of these lie in the same straight line except 4 points which are collinear. Find the number of triangles that can be formed for which the points are their vertices?
Choose the correct alternative:
The number of parallelograms that can be formed from a set of four parallel lines intersecting another set of three parallel lines
Choose the correct alternative:
If 10 lines are drawn in a plane such that no two of them are parallel and no three are concurrent, then the total number of points of intersection are
Choose the correct alternative:
In a plane there are 10 points are there out of which 4 points are collinear, then the number of triangles formed is
