求解一道GWD数学题

eliasfan

How many different 6-letter sequences are there that consist of 1 A, 2 B’s, and 3 C’s ?


A.6
B.60
C.120
D.360
E.720

eliasfan

The answer is B
but I want to know how to get it ?

eliasfan

Is the integer n odd?
(1)      n is divisible by 3.
(2)      2n is divisible by twice as many positive integers as n.
    
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

eliasfan

上面题目中 条件（2）2n is divisible by twice as many positive integers as n.怎么解释啊？