问俩到PREP~NN进来指点！

1.for any positive integer n, the length of n is defined as the number of prime factors whose product is n. For example,  the length of 75 is 3, since 75=3*5*5. how many two-digit positive integers have length 6?

A.none

B.one

C.Two

D. three

E.four

答案是C。我想6个不同质因子组成的2位数不存在啊？肯定超过100了。就选了A..望NN解答

2. Some of the students erolled at College T are part-time students and the rest are full-time students. By what percent did the number of full-time students enrolled at College T increase from the fall of 1999 to the fall of 2000？

1.There were 50 more full-time students enrolled at College T in the fail of 2000 than in the fall of 1999

2.The total number of students enrolled at College T increased by 5 percent from the fall of 1999 to the fall of 2000

我选了B。答案是E，B难道不能单独决定么？。。