If A = {3, 6, 9, 12}, then n(A) =
3
4
6
12
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n(A) means the number of elements in set A.
A = {3, 6, 9, 12} has 4 elements, so n(A) = 4.
Hence, option 2 is the correct option.
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Which of the following statements is true?
-8 is greater than -5
|-12| = -12
(-9) + (-3) = -12
0 is the smallest negative integer
Which of these numbers is not divisible by 9?
729
486
634
891