How many zeroes are there at the end of the number N, if N = 60! + 120! ? Choices: A) 12 B) 14 C) 16 D) 18 E) 20
The number of zeroes at the end of 60! will be less than the number of zeroes at the end of 120!   Hence it is sufficient to calculate the number of zeroes at the end of 60!   The number of zeroes = [60/5] + [60/25] + [60/125] = 12 + 2 + 0= 
<gadget id="calculator">12 + 2 + 0</gadget>
<output>14</output>
14   The answer is 14.
<result>B</result>
How many zeroes are there at the end of the number N, if N = 60! + 120! ?