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The least prime is 1         (b)   2 ...

The least prime is 1         (b)   2         (c)  3       (d)  5

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The least prime number is 0 (b) 1 (c) 2 (d) 3

The ratio of LCM and HCF of the least composite and the least prime numbers is (a) 1:2 (b) 2:1 (c) 1:1 (d) 1:3

The successor of the smallest prime number is 1 (b) 2 (c) 3 (d) 4

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

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

Which of the following are not twin-primes? 3, 5 (b) 5, 7 (c) 11, 13 (d) 17, 23

The number of primes between 90 and 100 is 0 (b) 1 (c) 2 (d) 3

The smallest number which is neither prime no composite is 0 (b) 1 (c) 2 (d) 3

The number of prime numbers between 301 and 320 are 3 (b) 4 (c) 5 (d) 6

The exponent of 2 in the prime factorisation of 144, is (a) 4 (b) 5 (c) 6 (d) 3

RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. The total number of even prime numbers is 0      (b)  1      (c)   ...

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  2. Which one of the following is a prime number? 161      (b)  221    ...

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  3. The least prime is 1         (b)   2         (c)  3       (d)  5

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  4. Which of the following numbers is divisible by 24?

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  5. Which of the following numbers is divisible by 4? 8675231        ...

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  6. Which of the following numbers is divisible by 6? 7908432       ...

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  7. Which of the following numbers is divisible by 8? 87653234         ...

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  8. Which of the following numbers is divisible by 9? 9076185          ...

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  9. Which of the following numbers is divisible by 11? 111111    (b)...

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  10. If 1*548 is divisible by 3, then * can take the value 0         (b...

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  11. 5 * 2 is a three digit number with * as a missing digit. If the num...

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  12. What least value should be given to * so that the number 6342 * 1 i...

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  13. What least value should be given to * so that the number 653 * 47  ...

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  14. What least value should be given to * so that the number 653 * 47 i...

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  15. What least value should be given to * so that the number 63576 * 2 ...

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  16. Which one of the following numbers is exactly divisible by 11? 2356...

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  17. If 1 * 548 is divisible by 3, which of the following digits can rep...

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  18. The sum of the prime numbers between 60 and 75 is 199          (...

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  19. The HCF of two consecutive natural numbers is 0          (b)  1    ...

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  20. The HCF of two consecutive even number is 1          (b)  2        ...

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