another question; 0^0=0???? or 0^0 不存在
10! =10 *9*8*7*6*5*4*3*2*1????
Q17:
If n is the greatest positive integer for which 2n is a factor of 10!, then n =
A. 2
B. 4
C. 6
D. 8
E 10
D 10!里有2^8.
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