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If x\ a n d\ y are two co-primes, then t...

If `x\ a n d\ y` are two co-primes, then their LCM is `x y` (b) `x+y` (c) `x/y` (d) 1

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RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. The HCF of an even number and an odd number is 1         (b)   2   ...

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  2. The LCM of 24, 36 and 40 is 4          (b)  90          (c)  360...

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  3. If x\ a n d\ y are two co-primes, then their LCM is x y (b) x+y ...

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  4. If the HCF of two numbers is 16 and their product is 3072, then the...

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  5. The least number divisible by 15, 20, 24, 32 and 36 is 1440        ...

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  6. The smallest number which when diminished by 3 is divisible by 11, ...

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  7. Three numbers are in the ratio 1:2:3 and their HCF is 6, the number...

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  8. The ratio of two numbers is 3:4 and their HCF is 4. Their LCM is 12...

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  9. Which of the following numbers is prime? 23         (b)  51      (c...

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  10. Which of the following numbers are twin primes? 3, 5          (b)  ...

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  11. What smallest digit be written in the blank space of the number ......

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  12. Which of the following numbers is divisible by 6? 1258     (b)  ...

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  13. Which of the following numbers is divisible by 11? 7138965      ...

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

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  15. Which of the following numbers is not divisible by 4? 78536       ...

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  16. The smallest prime just greater than the HCF of 84 and 144 is 11   ...

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  17. Every counting number has an infinite number of factors               ...

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  18. What least number should be replaced by * so that the number 37610*...

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  19. Make a list of seven consecutive numbers, none of which is prime.

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  20. The HCF of two numbers is 23 and their product is 55545. Find their...

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