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What smallest digit be written in the blank space of the number .... 6724 so that the number formed is divisible by 3? 3         (b)   4      (c)  2        (d)  1

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RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. Which of the following numbers is prime? 23         (b)  51      (c...

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

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

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

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

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

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

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

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

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

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

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

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  13. Find the smallest 5-digit number which is exactly divisible by 20, ...

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  14. Find the largest number which divides 615 and 963 leaving remainder...

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  15. The length, breadth and height of a room are 1050 cm, 750cm and 425...

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  16. Find the greatest number of four digits which is exactly divisible ...

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  17. Reduce (289)/(391) to the lowest terms

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  18. Three tankers contain 403 litres, 434 litres and 465 litres of dies...

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  19. A number which has only two factors is called a ...........

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  20. The smallest composite number is ............

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