Question

If A is a set of one digit number greater than zero, how many elements will it have?A. 9 B. 10 C. 11 D. 12

Answer 1

The non-negative one-digit numbers are

$0,1,2,3,4,5,6,7,8,9$

Since the elements of set A has to be greater than zero, the elements of such a set are

$A=\lbrace1,2,3,4,5,6,7,8,9\rbrace\rightarrow9\text{ elements}$

Therefore, the answer is 9, option A.