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Write five pairs of prime numbers les...

Write five pairs of prime numbers less than 20 whose sum is divisible by 5. Hint : 3+7 = 10)

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MTG IIT JEE FOUNDATION-PLAYING WITH NUMBERS-NCERT SECTION (EXERCISE 3.2)
  1. Express the following as the sum of two odd primes. 36

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

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

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

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  5. Which of the following numbers are prime? 23

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  6. Which of the following numbers are prime? 51

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  7. Which of the following numbers are prime? 37

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  8. Which of the following numbers are prime? 26

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

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

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

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

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

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

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

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

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  17. Fill in the blanks: 1 is neither nor

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  18. Fill in the blanks: The smallest prime number is

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  19. Fill in the blanks: The smallest composite number is

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  20. Fill in the blanks: The smallest even number is

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