MathematicsThe sum of the first five prime numbers is:

The sum of the first five prime numbers is:


  1. A
    11
  2. B
    18
  3. C
    26
  4. D
    28 

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    Solution:

    Concept- Prime numbers are the numbers which are divisible by only two numbers. First by 1 and the second number itself, which means they only have 2 factors. They are a whole number greater than 1.
    1 is not considered as a prime number, as it has only 1 factor.
    Prime number 1- 2 is a prime number, as it has only 2 factors, i.e., 1 and 2 itself.
    Prime number 2 - 3 is a prime number, as it has only 2 factors, i.e., 1 and 3 itself.
    4 is not a prime number, as it has 3 factors, i.e., 1, 2 and 4.
    Prime number 3 - 5 is a prime number, as it has only 2 factors, i.e., 1 and 5 itself.
    6 is not a prime number, as it has 4 factors, i.e., 1, 2, 3 and 6.
    Prime number 4 - 7 is a prime number, as it has only 2 factors, i.e., 1 and 7 itself.
    8 is not a prime number, as it has 4 factors, i.e., 1, 2, 4 and 8.
     9 is not a prime number, as it has 3 factors, i.e., 1, 3 and 9.
    10 is not a prime number, as it has 4 factors, i.e., 1, 2, 5 and 10.
    Prime number 5- 11 is a prime number, as it has only 2 factors, i.e., 1 and 11 itself.
    Now, the sum of the first five prime numbers =2+3+5+7+11=28  
    Hence, the correct answer is option 4.
     
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