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The sum of all the prime numbers from 1 ...

The sum of all the prime numbers from 1 to 20 is 75         (b)   76           (c)  77          (d)  78

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RS AGGARWAL-NUMBER SYSTEM-All Questions
  1. The prime numbers dividing 143 and leaving a remainder of 3 in each ca...

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  2. The sum of the first four primes is (a) 10         (b) 11         (...

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  3. The sum of all the prime numbers from 1 to 20 is 75         (b)...

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  4. A prime number N, in the range 10 to 50, remains unchanged when its...

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  5. The remainder obtained when any prime number greater than 6 is divi...

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  6. Which of the following is not a prime number? 21           (b)  23 ...

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  7. Which of the following is a prime number 19          (b)  20      ...

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  8. Which of the following is a prime number? (a) 115       (b) 119    ...

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  9. Which of the following is a prime number? (a) 143       (b) 289    ...

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  10. The smallest value of natural number n, for which 2n + 1 is not a p...

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  11. The smallest three-digit prime number is 101          (b)  103    ...

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  12. How many of the integers between 110 and 120 are prime numbers? 0  ...

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  13. Four prime numbers are arranged in ascending order. The product of ...

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  14. The sum of three prime numbers is 100. If one of them exceeds anoth...

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  15. Which one of the following is a prime number? 161          (b)   22...

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  16. The smallest prime number, that is the fifth term of an increasing ...

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  17. The number of prime numbers between 301 and 320 are 3        (b...

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  18. Consider the following statements: (1) If p > 2 is a prime, then it ca...

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  19. What is the first value of n for which n^2+n+41 is not a prime? 1 ...

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  20. Let Xk=(p1*p2*...*pk)+\ 1,where\ p1,\ p2,\ ...,pk are the first k prim...

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