Home
Class 12
MATHS
IF ""^(10)p r = 5040 then r=...

IF `""^(10)p _r = 5040` then r=

A

4

B

9

C

8

D

5

Text Solution

Verified by Experts

The correct Answer is:
A
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • PERMUTATIONS & COMBINATIONS

    AAKASH SERIES|Exercise EXERCISE-II|229 Videos

  • PARTIAL FRACTIONS

    AAKASH SERIES|Exercise PRACTICE EXERCISE|31 Videos

  • PROBABILITY

    AAKASH SERIES|Exercise Practise Exercise|165 Videos

Similar Questions

Explore conceptually related problems

If ""^(n)P_(r)=5040 and ""^(n)C_(r)=210, find n and r.

If ""^(n)P_(r)=5040 and ""^(n)C_(r)=210 , find n and r.

Knowledge Check

  • IF ""^(15)P_(r-1):""^(16)P_(r-2) = 3 : 4 then r=

    A
    10
    B
    14
    C
    6
    D
    8

  • If ""^(n)P_(r)=3024 then (n,r) is

    A
    (4,9)
    B
    (9,4)
    C
    (9,6)
    D
    (6,9)

  • I : IF ""^(n+1) P_(5) : ""^(n)P_(5)=3:2 then n=14 . II . IF ""^(56)P_(r-6) : ""^(56)P_(r+3)=30800 : 1 then r= 41.

    A
    Only 1 is ture
    B
    only II is true
    C
    Both I and II are true
    D
    neither a nor II true

    • Similar Questions

    Explore conceptually related problems

    If ""^(12)P_r=1320 find r

    If ""^9P_5+"5 "^9P_4=^(10)P_r then find r

    If ""^(n)P_(r)=30240 and ""^(n)C_(r)=252 then the ordered pair (n,r)=

    IF ""^(20)P_(r):""^(20)P_(r-1)=15 :1 then r=

    In Delta ABC , if r_1= 3 r_2 = 10 , r_3 = 15, then R =

    Home
    Profile