prep36数学求助

jjapollo

36.  

In a certain deck of cards, each card has a positive integer written on it.  In a multiplication game, a child draws a card and multiplies the integer on the card by the next larger integer.  If each possible product is between 15 and 200, then the least and greatest integers on the cards could be

 

(A) 3 and 15

(B) 3 and 20

(C) 4 and 13

(D) 4 and 14

(E) 5 and 14

谢谢各位牛牛了

答案选Ｃ。麻烦告诉我详细点的解题过程谢谢

taoyeye

看懂题，这题就是求一个正整数和比他大1的正整数相乘的值

3*4=12<15, 4*5=20>15 so 最小为4

14*15=210>200, 13*14=182<200 so 最大为13

羽依依

楼上正解.