If ^n Cr=84 ,and ^n C(r-1)=36 , and r = ...

`If ^n C_r=84` ,`and ^n C_(r-1)=36` , and r = 1 , then find the value of `ndot`

Text Solution

AI Generated Solution

Topper's Solved these Questions

LOGARITHM
CENGAGE ENGLISH|Exercise All Questions|173 Videos
PROBABILITY
CENGAGE ENGLISH|Exercise All Questions|1 Videos

Similar Questions

Explore conceptually related problems

If ^nC_r=84 ,^n C_(r-1)=36 ,a n d^n C_(r+1)=126 , then find the value of ndot

If ""^n C_(r-1) = 36, ""^(n) C_(r) = 84 and ""^(n) C_(r+1) = 126 then find the value of r.

If ""^(n)C_(r -1) = 36, ""^(n)C_(r) = 84 " and " ""^(n)C_(r +1) = 126 , then find the value of ""^(r)C_(2) .

If ^n P_r=^n P_(r+1)a n d^n C_r=^n C_(r-1,) then the value of n+r is.

If n P_r=^n P_(r+1) and n C_r=^n C_(r-1,) then the value of (n+r) is.

If .^(n)C_(r-1): .^(n)C_(r): .^(n)C_(r+1)=3:4:5 , find the values of n and r.

If .^(n+1)C_(r+1.): ^nC_r: ^(n-1)C_(r-1)=11:6:3 find the values of n and r.

If .^(n+1)C_(r+1):^(n)C_(r):^(n-1)C_(r-1)=11:6:3 , find the values of n and r.

If .^(n)C_(r-1)=36, .^(n)C_(r)=84 and .^(n)C_(r+1)=126 , find n and r.

If n is a positive integer and C_r = ""^nC_r then find the value of sum_(x = 1)^n r^2 ((C_r)/(C_(r - 1)) )

CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions

m men and n women are to be seated in a row so that no two ...
Text Solution
|
10 different letters of an alphabet are given. Words with 5 letters ar...
Text Solution
|
If ^n Cr=84 ,and ^n C(r-1)=36 , and r = 1 , then find the value of ndo...
Text Solution
|
Eight chairs are numbered 1 to 8. Two women and three men wish to oc...
Text Solution
|
The value of expression .^47 C4+sum(j=1)^5.^(52-j)C3 is equal to a.....
Text Solution
|
The number of n digit numbers which consists of the digit 1 and 2 on...
Text Solution
|
If ^n C3+^n C4>^(n+1)C3 , then a. n >6 b. n >7 c. n<6 ...
Text Solution
|
The value of sum(r=0)^(n-1)^n Cr//(^n Cr+^n C(r+1)) equals a. n+1 ...
Text Solution
|
A bag contains four one-rupee coins, two twenty-five paisa coins, a...
Text Solution
|
There are four letters and four directed envelopes. The number of w...
Text Solution
|
Kanchan has 10 friends among whom two are married to each other. Sh...
Text Solution
|
Number of ways in which three numbers in A.P. can be selected from ...
Text Solution
|
The total number of positive integral solution of 15 < x1+x2+x3 lt= 20...
Text Solution
|
A train time table must be compiled for various days of the week, so t...
Text Solution
|
The streets of a city are arranged like the like the lines of a che...
Text Solution
|
A batsman scores exactly a century by hitting fours and sixes in 20...
Text Solution
|
In how many ways can 2t+1 identical balls be placed in three distinct ...
Text Solution
|
Sohan has x children by his first wife. Geeta has (x+1) children by he...
Text Solution
|
let a1,a2,...an be in A.P. wth common difference pi/6. if seca1seca2+s...
Text Solution
|
Six apples and six mangoes are to be distributed among ten boys so ...
Text Solution
|