Given
Range of numbers = 1 to 25
Formula Used
Sum = Sum of all odd prime numbers in the given range
Solution
Odd prime numbers between 1 and 25 are 3, 5, 7, 11, 13, 17, 19, 23.
Note: 2 is a prime number but it is even, so it is excluded.
Sum = 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 = 98
So the correct answer is (c)
English
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150 Mins English English150 Questions150 Marks150 Mins English English150 Questions150 Marks150 Mins EnglishThe product of two prime numbers is 437. What is the smaller of the two numbers?
Let a, b, α and β be prime numbers. n is the number of ordered pairs of a and b where 2< a < b < 50 and b-a=2. Also, α and β are the least and the greatest prime numbers less than 50. What is the value of n(α+β)?
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