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Q.

The sum of all those prime numbers which are less than 31 is


Options:-

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a

119

b

129

c

132

d

137 

answer is B.

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Detailed Solution

Concept:
We'll start by listing all the factors of integers lower than 31. Prime numbers are those that only have two elements. Therefore, we shall choose all prime numbers that are smaller than 31. To obtain the necessary result, we shall then sum all the prime numbers between 1 and 30.
Prime numbers below 31 include 2,3,5,7,11,13,17,19,23, and 29.
The sum of prime numbers that are less than 31 is what we're looking for.
That is,
2+3+5+7+11+13+17+19+23+29=129
Hence,the correct option is 2.
 
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