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The sum of the first four primes is (a) ...

The sum of the first four primes is (a) 10         (b) 11         (c) 16       (d) 17

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Sum of the first four positive prime numbers

The average of the first nine prime numbers is (a) 9 (b) 11 (c) 11(1)/(9) (d) 11(2)/(9)

The mean of the first ten even natural numbers is (a) 9 (b) 10 (c) 11 (d) 12

The median of first 10 prime numbers is (a) 11 (b) 12 (c) 13 (d) 14

Of four numbers whose average is 60, the first is one-fourth of the sum of the last three.The first number is (a) 15 (b) 42 (c) 45 (d) 48

Which of the following numbers are twin primes? 3,5 (b) 5,11 (c) 3,11 (d) 13,17

The sum of the exponents of the prime factors in the prime factorisation of 196, is (a) 1 (b) 2 (c) 4 (d) 6

The mean of a data is 15 and the sum of the observations is 195. The number of observations is 13 (b) 19 16 (d) 17

The sum of four consecutive even numbers A,B,C and D is 180. What is the sum of the set of next four consecutive even numbers? 196 (b) 204 (c) 212 (d) 214 (e) None of these

RS AGGARWAL-NUMBER SYSTEM-All Questions
  1. The number of prime numbers between 0 and 50 is 14          (b)...

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  2. The prime numbers dividing 143 and leaving a remainder of 3 in each ca...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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