单选题 How many positive whole numbers less than or equal to 50 are NOT equal to squares of whole numbers?
  • (A) 9
  • (B) 15
  • (C) 43
  • (D) 44
  • (E) 45


【正确答案】 C
【答案解析】To solve this problem, first find all the whole number squares less than or equal to 50:
12=1
22=4
32=9
42=16
52=25
62=36
72=49
This leaves 43 remaining positive whole numbers that are less than or equal to 50 and are not squares of whole numbers.