if K is a positive integer, is K the square of an integer?
(1) k is divisible by 4
(2) k is divisible by exactly 4 different prime numbers.
第二个条件是不是说k刚好可以被四个不同的质数除尽(就是说只有这四个因子,除了1和k本身)?例如,210=2x3x5x7.
答案是b吗
is 210=2x3x5x7 the square of an integer?
if not, B alone is not sufficient
不是很明白楼上的意思了。。。。
到底B对么?只能被四个质数除就是说合数就完全不算了咯?这样的数2*2*5*5*7*7*11*11是不对的咯?
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