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Find the numbers between 1 and 20 having...

Find the numbers between 1 and 20 having exactly three factors

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The correct Answer is:
4 and 9
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NAND LAL PUBLICATION-PLAYING WITH NUMBERS -SAMPLE PAPER FOR PRACTICE
  1. Fill in the blanks in the following: A number which has only two facto...

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  2. HCF of first ten natural numbers is

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  3. Give an example of a number which is divisible: (a) 2 but not by 4 ...

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  4. Express each of the following numbers as two odd primes. (a) 44 , (b)...

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  5. Find the possible missing twins for the following numbers so that they...

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  6. Express the following numbers as the sum of two odd primes: (a) 66 , (...

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  7. Can two numbers have 15 as their HCF and 175 as LCM Why?

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  8. Fill in the blanks: Factors which are not included in the prime fac...

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  9. For a number greater than 10 but less than 20 to be prime, the possibl...

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  10. Every number hasnumber of multiples andnumber of factors.

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  11. Find the numbers between 1 and 20 having exactly three factors

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  12. What should be added to 5407 to make it divisible by 9.

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  13. What least number must be subtracted from 2258 to make it divisible by...

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  14. Replace the blank space in 526 [ ] with the least number so that it is...

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  15. Write the number from 10 to 30 and identify. A pair of twin primes

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  16. Write the number from 10 to 30 and identify. A pair of co-primes

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  17. Write the number from 10 to 30 and identify. A perfect number

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  18. Write the number from 10 to 30 and identify. composite numbers

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  19. Write the number from 10 to 30 and identify. Two prime numbers

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  20. Write the number from 10 to 30 and identify. Two odd numbers

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