Questions
The number of rational numbers lying in the interval (2015, 2016) all whose digits after the decimal point are non-zero and are in decreasing order is
Remember concepts with our Masterclasses.
80k Users 60 mins Expert Faculty Ask Questions
a
∑i=19 9Pi
b
∑i=110 9Pi
c
29−1
d
210−1
Ready to Test Your Skills?
Check Your Performance Today with our Free Mock Tests used by Toppers!detailed solution
Correct option is C
A rational number of the desired category is of the form 2015. x1x2…xk and 9 ≥ x1 > x2 > … > xk ≥ 1. We can choose k digits out 9 in 9Ckways and arrange them in de creasing order in just one way. Thus, the desired number of rational numbers is 9C1+9C2+…+ 9C9=29−1Similar Questions
is equal to
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
free study material
JEE
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests
Popular Books
HC Verma Part 1HC Verma Part 2RS AgarwalRD SharmaLakhmir SinghDK GoelSandeep GargTS GrewalNCERT solutions
Class 12 NCERT SolutionsClass 11 NCERT SolutionsClass 10 NCERT SolutionsClass 9 NCERT SolutionsClass 8 NCERT SolutionsClass 7 NCERT SolutionsClass 6 NCERT Solutions
