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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 (a) `x y` (b) `x+y` (c) `x/y` (d) 1

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

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  2. The LCM of 24, 36 and 40 is (a) 4          (b)  90          (c)  3...

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

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

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

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  6. The smallest number which when diminished by 3 is divisible by 11, 2...

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

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

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

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

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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? (a) 1258     (b)...

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

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

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

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  16. The smallest prime just greater than the HCF of 84 and 144 is (a) 1...

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  17. Every counting number has an infinite number of (a )factors           ...

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  18. What least number should be replaced by * so that the number 37610*2...

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  19. Define a perfect number. Write two perfect numbers.

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

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