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What are co-primes? Give examples of fiv...

What are co-primes? Give examples of five pairs of co-primes. Are co-primes always prime? If no, illustrate your answer by an example.

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
  1. What are composite numbers? Can a composite number be odd? If yes, ...

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

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

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

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  5. Express each of the following as a sum of two or more primes: (i) 1...

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

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  7. Express each of the following numbers as the sum of twin primes: (i...

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  8. Find the possible missing twins for the following numbers so that th...

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  9. A list consists of the following pairs of numbers: 51, 53; 55,57; 59...

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

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

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

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

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  14. Factorize 234 into prime factors.

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  15. Determine prime factorization of 9000.

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  16. Determine prime factorization of 20570.

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

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  18. Find the smallest number having four different prime factors.

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  19. In which of the following expressions, prime factorization has been ...

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  20. Determine prime factorization of each of the following numbers: (i)...

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