Questions
The tensdigit of 1! + 2! + 3! + … + 49! is
detailed solution
Correct option is A
We know that 1! + 2! + 3! + 4! = 33Also, 5! = 120, 6! = 720, 7! = 5040, 8! = 40320 and 9! = 362880.Thus, tens digit of 1! + 2! + … + 9! is 1.Also, note that n! is divisible by 100 for all n ≥ 10. Therefore, the tens digit of 1! + 2! + … + 49! is 1.Similar Questions
Let (where, [ . ] denotes greatest integer function) is equal to
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests