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The smallest value of natural number n, ...

The smallest value of natural number n, for which 2n + 1 is not a prime number, is 3         (b)   4            (c)  5         (d)   None of these

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RS AGGARWAL-NUMBER SYSTEM-All Questions
  1. Which of the following is a prime number? (a) 115       (b) 119    ...

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

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

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

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

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

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

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

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

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

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

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

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

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  14. 6xx3\ (3-1) is equal to 19 (b) 20 (c) 36 (d) 53

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  15. 1234+2345-3456+4567=\ ? (a) 4590 (b) 4670 (c) 4680 (d) 4690 ...

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  16. 5566−7788+9988=? +4444 (a) 3223 (b) 3232 (c) 3322 (d) 3333 (e) None of...

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  17. 38649-1624-4483=? 32425 (b) 32452 (c) 34522 (d) 35422 None of t...

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  18. 884697-773697-102479=\ ?\ 8251 (b) 8512 (c) 8521 (d) 8531 None...

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  19. 10531+4813-728=?xx87 168 (b) 172 (c) 186 (d) 212 None of these

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  20. What is 394 times 113? 44402      (b)  44522           (c)  44632  ...

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