What is J = {x : x is a whole number divisible by 10 and x < 50}?
Answer and explanation
Correct answer: J = {0, 10, 20, 30, 40}
The governing concepts are whole numbers, divisibility, and a strict upper bound. Whole numbers include 0, and 0 is divisible by 10 because 0 = 10 × 0. The multiples of 10 below 50 are therefore 0, 10, 20, 30 and 40. Options C and D wrongly include 50, while A omits the valid whole number 0. Hence option B is correct.
Frequently asked questions
What is the correct answer to this question?
J = {0, 10, 20, 30, 40}
Why is this the correct answer?
The governing concepts are whole numbers, divisibility, and a strict upper bound. Whole numbers include 0, and 0 is divisible by 10 because 0 = 10 × 0. The multiples of 10 below 50 are therefore 0, 10, 20, 30 and 40. Options C and D wrongly include 50, while A omits the valid whole number 0. Hence option B is correct.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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