Question

Sum of all prime numbers less than $ 15 $ is:
(A) $ 41 $
(B) $ 45 $
(C) $ 72 $
(D) $ 48 $

Answer 1

Hint: In the given question, we are required to find the sum of all the prime numbers less than $ 15 $ . Prime numbers are the numbers that do not have any other factor except for $ 1 $ and the number itself. In other words, prime numbers cannot be divided by any other number except $ 1 $ and the number itself.

Complete step-by-step answer:
So, in order to solve the given question, we have to find all the prime numbers less than $ 15 $ and then add all of them up so as to find the correct answer to the solution.
So, the prime numbers less than $ 15 $ are:
 $ 2 $ , $ 3 $ , $ 5 $ , $ 7 $ , $ 11 $ and $ 13 $ .
So, the sum of all these prime numbers that are less than $ 15 $ is $ 2 + 3 + 5 + 7 + 11 + 13 $
Now, adding up all the numbers, we get,
 $ \Rightarrow 5 + 12 + 24 $
 $ \Rightarrow 41 $
So, the sum of all prime numbers less than $ 15 $ is $ 41 $ . So, option (A) is correct.
So, the correct answer is “Option A”.

Note: The given question revolves around the number system. One must know about the definition of the prime numbers in order to solve such types of questions. Care should be taken while doing calculations. Calculations must be verified once in order to be sure of the answer.