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Write down separately the prime and composite numbers less than 20.

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MTG IIT JEE FOUNDATION-PLAYING WITH NUMBERS-NCERT SECTION (EXERCISE 3.2)
  1. State whether the following statements are True or False : The produ...

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  2. The numbers 13 and 31 are prime numbers. Both these numbers have same ...

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  3. Write down separately the prime and composite numbers less than 20.

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  4. What is the greatest prime number between 1 and 10?

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  5. Express the following as the sum of two odd primes. 44

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  6. Express the following as the sum of two odd primes. 36

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  7. Express the following as the sum of two odd primes. 24

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  8. Express the following as the sum of two odd primes. 18

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  9. Give three pairs of prime numbers whose difference is 2. [Remark : ...

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  10. Which of the following numbers are prime? 23

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  11. Which of the following numbers are prime? 51

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  12. Which of the following numbers are prime? 37

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  13. Which of the following numbers are prime? 26

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  14. Write seven consecutive composite numbers less than 100 so that the...

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  15. Express each of the following numbers as the sum of three odd primes: ...

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  16. Express each of the following numbers as the sum of three odd primes: ...

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  17. Express each of the following numbers as the sum of three odd primes: ...

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  18. Express each of the following numbers as the sum of three odd primes: ...

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  19. Write five pairs of prime numbers less than 20 whose sum is divisib...

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  20. Fill in the blanks : (a) A number which has only two factors is ...

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