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We have given HCF = 13 LCM = 1989 One ...

We have given HCF = 13 LCM = 1989 One number is 117 Let the other number be x We have given HCF = 13 LCM = 1989 One number is 117 Let the other number be x Substitute, Therefore, Other number is 221. Substitute, Therefore, Other number is 221.

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RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. Find the H.C.F. and L.C.M. of 1152 and 1664.

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  2. Given that the H.C.F. of two numbers is 16 and their product is 640...

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  3. We have given HCF = 13 LCM = 1989 One number is 117 Let the other n...

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  4. Can two numbers have 18 as their HCFand 380 as their LCM? Give reason.

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  5. Find the H.C.F. and L.C.M. of the following pairs of numbers: 117, ...

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

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

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

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  9. Can two numbers have 18 as their HCFand 380 as their LCM? Give reason.

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  10. Which of the following numbers is a perfect  number? 4      (b)  12...

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  11. Which of the following are not twin-primes? 3, 5          (b)  5, 7...

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

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

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

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

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

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  17. The total number of even prime numbers is 0      (b)  1      (c)   ...

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  18. Which one of the following is a prime number? 161      (b)  221    ...

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  19. The least prime is 1         (b)   2         (c)  3       (d)  5

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  20. Which of the following numbers is divisible by 24?

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