Question 28: Let the set A be the set of natural numbers less than 100 and divisible by 2 and 3; B is the set of three-digit natural numbers that are divisible by 8; C is the set of two-digit natural numbers that are divisible by 3 and 5; D is the set of natural numbers less than 1000 and divisible by 4. Choose the wrong answer:

The set A is the set of natural numbers less than 100 and divisible by 2 and 3, or divisible by 6.

⇒ Set A = {0; 6; twelfth; 18; …; 96} A has (96 – 0) : 6

+ 1 = 17 (element).

B is the set of three-digit natural numbers that are divisible by 8.

⇒ Set B = {104; 112; 120;…;992} ⇒ B has (992 – 104) : 8 + 1 = 112 (element).

C is the set of two-digit natural numbers that are divisible by 3 and 5 or by 15.

⇒ Set C = {15; 30; 45;…;90} ⇒ C has (90 – 15) : 15 + 1 = 6 (element).

D is the set of natural numbers less than 1000 and divisible by 4.

⇒ Set D = {0; 4; 8; twelfth; …;996} ⇒ D has (996 – 0) :4 + 1 = 250 (element).

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