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The numbers 13 and 31 are prime numbers....

The numbers 13 and 31 are prime numbers.Both these numbers have same digits1 and 3 .Find such pairs of prime numbers upto 100.

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NAND LAL PUBLICATION-PLAYING WITH NUMBERS -EXERCISE 3.2
  1. State whether the following statements are True of False: All even num...

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  2. State whether the followin statements are True of False: The product o...

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

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

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

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  6. Express the following as the sum of two odd primes: 44

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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: 24

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  9. Express the following as the sum of two odd primes: 18

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  10. Give three pairs of prime numbers whose diffrene is 2.[Remark:Two prim...

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  11. Which of the following numbers are prime? (a) 23, (b) 51,( c) 37, (d...

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  12. Write seven consecutive composite numbers less than 100 so that there ...

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

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

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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. Write five pairs of prime numbers below 20 whose sum is divisible by 5...

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  18. Fill in the blanks in the following: A number which has only two facto...

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  19. A number which has more than two factors is called a number.

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  20. 1 is neither prime nor

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