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The sum of the first five prime numbers is:
18
11
28
26
28
Memorize the first few primes: 2, 3, 5, 7, 11, 13... Add them sequentially: 2+3=5, 5+5=10, 10+7=17, 17+11=28.
The sequence of prime numbers starts with 2, 3, 5, 7, 11, ...
S=тИСi=1nтАЛpiтАЛ
Memorize the first few primes: 2, 3, 5, 7, 11, 13... Add them sequentially: 2+3=5, 5+5=10, 10+7=17, 17+11=28.
Many students mistakenly include 1 as a prime number. 1 is neither prime nor composite.
Identify the first five prime numbers
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. The first five prime numbers are 2, 3, 5, 7, and 11.
P={2,3,5,7,11}
Sum the identified numbers
Add the identified prime numbers together to find the required sum.
Sum=2+3+5+7+11
Calculate the total
Performing the addition: 2 + 3 = 5, 5 + 5 = 10, 10 + 7 = 17, 17 + 11 = 28.
Sum=28
C is correct because the sum of the first five prime numbers (2, 3, 5, 7, 11) is 28.
Prime numbers are foundational in cryptography (RSA encryption) and LCM/HCF problems in competitive exams.
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