What is M={x∈N: x is a two-digit prime number less than 30}?
Answer and explanation
Correct answer: M={11,13,17,19,23,29}
The governing conditions are “two-digit,” “prime,” and “less than 30.” The two-digit candidates from 10 to 29 are tested for having exactly two positive factors. The primes are 11, 13, 17, 19, 23, and 29. One-digit primes in B are excluded, 10 in C is composite, and 15 in D is divisible by 3 and 5. Hence A gives precisely M.
Frequently asked questions
What is the correct answer to this question?
M={11,13,17,19,23,29}
Why is this the correct answer?
The governing conditions are “two-digit,” “prime,” and “less than 30.” The two-digit candidates from 10 to 29 are tested for having exactly two positive factors. The primes are 11, 13, 17, 19, 23, and 29. One-digit primes in B are excluded, 10 in C is composite, and 15 in D is divisible by 3 and 5. Hence A gives precisely M.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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