一道SAT数学题,求完整解题思路

问题描述:

一道SAT数学题,求完整解题思路
What is the greatest positive integer n so that 2^n is a factor of 12^10?
求完整解题思路

12^10=(3X4)^10=3^10*2^20
If 2^n is a factor of 12^10,means n is a factor of 20.
20=1*2*2*5
So n=1,2,4,10,20