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Question

The sum of the first six prime numbers is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
41

Prime Number Sum Calculation

The question requires finding the total value when the first six prime numbers are added together.

Identify First Six Prime Numbers

A prime number is a whole number greater than 1 whose only factors are 1 and itself. Remember that 1 is not a prime number.

The sequence starts with 2, which is the only even prime number.

The first six prime numbers in ascending order are:

  1. 2
  2. 3
  3. 5
  4. 7
  5. 11
  6. 13

Sum Calculation Steps

Add the identified prime numbers to get the final sum:

$ \text{Sum} = 2 + 3 + 5 + 7 + 11 + 13 $

Performing the addition:

$ 2 + 3 = 5 $

$ 5 + 5 = 10 $

$ 10 + 7 = 17 $

$ 17 + 11 = 28 $

$ 28 + 13 = 41 $

Thus, the sum equals 41.

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