Question
Find the 10’s digit of 1!+2!.....30!.
Answer: Option A
:
A
OPTION (d)for n≥10, n! is divisible by 100, hence the 10s digit will be zero for numbers greater than 10!Hence we will have to find the 10's digit of numbers form 1! to 9!we see that 1! ends with 12! ends with 2.... hence sum of 1! to 9! the last two digits will be 13 hence the option is a
Was this answer helpful ?
:
A
OPTION (d)for n≥10, n! is divisible by 100, hence the 10s digit will be zero for numbers greater than 10!Hence we will have to find the 10's digit of numbers form 1! to 9!we see that 1! ends with 12! ends with 2.... hence sum of 1! to 9! the last two digits will be 13 hence the option is a
Was this answer helpful ?
More Questions on This Topic :
Latest Videos
Latest Test Papers
Submit Solution