Symbiosis National Aptitude Test SNAP 2019 Paper

(5!)5!+(10!)10! + (50!)50!+(100!)100!
+ (49!×5×10)50!+(99!×100)100!
= (12×10)5!+(9!×10)10! + (49!×5×10)50!+(99!×100)100!
Now, (10)5! = (10)120 is a number that have 120 zeroes
(10)10! is a number that have more than 120 zeroes at the end.
(10)50! is a number that have more than 120 zeroes at the end.
and (100)100! is a number that have more than 120 zeroes at the end.
So, number of zeroes at the end of the sum = 120.