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What is the smallest odd prime? Is every...

What is the smallest odd prime? Is every odd number a prime number? If not, give an example of an odd number which is not prime.

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RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. Write all prime numbers between: (i)   70 and 90   (ii)  40 and 85

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  2. What is the smallest prime number? Is it an even number?

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  3. What is the smallest odd prime? Is every odd number a prime number?...

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  4. What are composite numbers? Can a composite number be odd? If yes, ...

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  5. What are the twin-primes? Write all pairs of twin prime between 1 and ...

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  6. What are co-primes? Give examples of five pairs of co-primes. Are co...

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  7. Which of the following pairs are always co-primes? (i)two p...

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  8. Express each of the following as a sum of two or more primes: 13   ...

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

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  10. Express each of the following numbers as the sum of twin primes: 36...

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  11. Find the possible missing twins for the following numbers so that t...

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  12. A list consists of the following pairs of numbers: 51, 53; 55,57; 5...

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  13. For a number, greater than 10, to be prime what may be the possible di...

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

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  15. State true (T) or false (F): The sum of primes cannot be a prime. The ...

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  16. Fill in the blanks in the following: A number having only two factors ...

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  17. Factorize 234 into prime factors.

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  18. Determine prime factorization of 9000.

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  19. Determine prime factorization of 20570

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  20. Write the smallest 5-digit number and express it as a product of pr...

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