If n is an integer, is n/15 an integer?
/>(1)3n/15is an integer.
(2)8n/15 is an integer.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目问的意思可以化简为n是否含有15这个因子,拆分就是是否同时含有3和5这两个质因子?
(1)化简得到n/5为整数,即n是含有5这个因子的整数,不充分
(2) 化简就是 2^3 n/ 3*5为整数,因此n一定同时含有3和5这两个质因子 ,正确