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For each of the following pairs of numbe...

For each of the following pairs of numbers, verify the property: product of the number = Product of their H.C.F. and L.C.M. (i) 25, 65       (ii)   117, 221          

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
  1. The H.C.F. and L.C.M. of two numbers are 13 and 1989 respectively. ...

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  2. Can two numbers have 18 as their HCF and 380 as their LCM? Give reason...

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  3. For each of the following pairs of numbers, verify the property: pro...

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  4. Find the H.C.F. and L.C.M. of the following pairs of numbers: (i) 11...

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  5. The L.C.M. and H.C.F. of two numbers are 180 and 6 respectively. If...

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  6. The H.C.F. of two numbers is 16 and their product is 3072. Find the...

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  7. the H.C.F. of two numbers is 145, their L.C.M. is 2175. If one numb...

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  8. Can two numbers have 18 as their HCF and 380 as their LCM? Give reason...

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  9. Which of the following numbers is a perfect number? (a) 16       ...

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  10. Which of the following are not twin-primes? (a) 3, 5           (b) 5,...

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  11. Which of the following are co-primes? (a) 8, 10          (b) 9, 10...

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  12. Which of the following is a prime number (a) 263          (b) 361 ...

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  13. The number of primes between 90 and 100 is (a) 0        (b) 1     ...

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  14. Which of the following numbers is a perfect number? (a) 16       ...

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  15. Which of the following is a prime number? (a) 203         (b) 139 ...

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  16. The total number of even prime numbers is (a) 0      (b) 1      (...

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  17. Which one of the following is a prime number? (a) 161      (b)  22...

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  18. The least prime number is (a)1         (b)2         (c)3       (...

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  19. Which of the following numbers is divisible by 5 or by 10? (i) 3345 (i...

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  20. Which of the following numbers is divisible by 4? (a) 8675231      ...

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