If n1,n2 are the number of 5 digit numbers in which the digits occur in increasing and decreasing orders respectively and n2-n1=Cr n, then a possible value of n+r is
see full answer
Your Exam Success, Personally Taken Care Of
1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.
An Intiative by Sri Chaitanya
a
15
b
14
c
11
d
12
answer is B.
(Unlock A.I Detailed Solution for FREE)
Best Courses for You
JEE
NEET
Foundation JEE
Foundation NEET
CBSE
Detailed Solution
n1=9c5,= selections of 5 digits from 9 non-zero digits n2=10C5= selections of 5 digits from 0 to 9n2−n1=9C5 or 9C4
If n1,n2 are the number of 5 digit numbers in which the digits occur in increasing and decreasing orders respectively and n2-n1=Cr n, then a possible value of n+r is