alleryHow many prime numbers are there between 1 and 20?
A7
B8
C9
D6
Answer & Solution
Correct answer: B. 8
The prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, and 19. Total count = 8.
Keep practising Number System
Browse all Number System questions for RRB NTPC, or explore more Mathematics topics.
Related questions
RRB NTPC · Number Values and CountsRRB NTPC · Integer Divisibility RulesRRB NTPC · Classifying Basic NumbersWhich of the following is a composite number?When a number is divided by 8, the quotient is 12 and remainder is 5. What is the number?What is the place value of 5 in the number 25,489?Which of the following numbers is divisible by 9?What is the sum of the first 10 natural numbers?