how many zeroes are there at the end of the number n , if n = 80 ! + 160 ! ?
"the number of zeroes at the end of 80 ! will be less than the number of zeroes at the end of 160 ! hence it is sufficient to calculate the number of zeroes at the end of 80 ! the number of zeroes = [ 80 / 5 ] + [ 80 / 25 ] + [ 80 / 125 ] = 16 + 3 + 0 = 19 the answer is b ."
add(divide(80, add(const_4, const_1)), const_2)