Questions
The number of positive integers < 1,00,000 which contain exactly one 2, one 5 and one 7 in its decimal representation is
a
2940
b
7350
c
2157
d
1582
detailed solution
Correct option is A
where X is a digit from 0 to 9. The digit 2 can occupy any of the five places, 3 can occupy any of the remaining 4 places and 7 any of the 3-remaining places. The remaining 2 places can be filled up by 7 digits. Thus, there are (5) (4) (3) (7) (7) = 2940 positive integers in the desired categoryTalk to our academic expert!
Similar Questions
The number of ways in which we can get at least 6 successive tails when a coin is tossed 10 times in a row, is
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
