Odd One Out: Identifying the Composite Number
The question requires identifying the number that does not share a common property with the rest of the numbers in the set {19, 37, 21, 17, 23, 29, 31, 11}. We need to analyze the properties of each number.
Number Properties Analysis
- 19: Prime number (only divisible by 1 and 19).
- 37: Prime number (only divisible by 1 and 37).
- 21: Composite number (divisible by 1, 3, 7, and 21).
- 17: Prime number (only divisible by 1 and 17).
- 23: Prime number (only divisible by 1 and 23).
- 29: Prime number (only divisible by 1 and 29).
- 31: Prime number (only divisible by 1 and 31).
- 11: Prime number (only divisible by 1 and 11).
Conclusion
All the numbers in the given set are prime numbers, except for the number 21, which is a composite number. Therefore, 21 is the odd one out.
Important Questions from Number System
What is the value of 1 2 + 2 2 + 3 2 + ......21 2 ?
Which sequence is correct to represent the hierarchical chain of number system?
(Where N - Natural Numbers
W - Whole Numbers
Q - Rational Numbers
Z - Integers)
What must be added to 45680 to make it exactly divisible by 9?
How many zeroes are there at the end of the following product?
1 x 5 x 10 x 15 x 20 x 25 x 30 x 35 x 40 x 45 x 50 x 55 x 60
Let XYZ be a three-digit number, where (x + y + Z) is not a multiple of 3. Then (XYZ + YZX + ZXY) is not divisible by
