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Questions and Answers
What is the missing number in the riddle: I am an odd number. Take one letter away and I become even. What number am I?
What is the missing number in the riddle: I am an odd number. Take one letter away and I become even. What number am I?
- 10
- 7 (correct)
- 31
- 99
What is the sum of the first 10 positive integers?
What is the sum of the first 10 positive integers?
- 45
- 55 (correct)
- 50
- 60
What is the value of pi (Ï€) correct to two decimal places?
What is the value of pi (Ï€) correct to two decimal places?
- 3.14 (correct)
- 3.18
- 3.16
- 3.12
Which of the following is a prime number?
Which of the following is a prime number?
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Study Notes
Riddle Solution
- The missing number is seven; it is odd.
- Removing the letter 's' from "seven" transforms it to "even," which denotes even numbers.
Sum of Positive Integers
- The sum of the first ten positive integers (1 through 10) is 55.
- This can be calculated using the formula for the sum of an arithmetic series: ( n(n + 1)/2 ).
Value of Pi
- The value of pi (Ï€) is approximately 3.14 to two decimal places.
- It represents the ratio of the circumference of a circle to its diameter.
Prime Number Identification
- A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself.
- Examples of prime numbers include 2, 3, 5, 7, 11, 13, 17, etc.
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