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Two perfect numbers are ...................

Two perfect numbers are .................. and ..................

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RD SHARMA-PLAYING WITH NUMBERS-All Questions
  1. The HCF of 100 and 101 is 10100          (b)  1001        (c)  1...

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  2. The greatest four digit number which when divided by 18 and 12 leav...

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  3. The GCD of two numbers is 17 and their LCM is 765. How many pairs o...

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  4. The number of factors of 1080 is 32           (b)   28           (c...

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  5. The HCF of first 100 natural numbers is 2        (b)  100        (c...

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  6. The least number exactly divisible by 36 and 24 is 144         (...

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  7. Find the HCF of all natural numbers from 200 to 478

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  8. If x is prime, y is a composite number such that x+y=240 and their LCM...

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  9. The LCM of two numbers is 1024 and one of them is a prime number, F...

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  10. The GCD of two numbers is 4 and their LCM is 400. How many pairs of va...

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  11. Find the greatest number that can divide 101 and 115 leaving remain...

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  12. Find the least three digit number which when divided by 20, 30, 40 ...

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  13. Find the largest number that divides 59 and 54 leaving remainders 3...

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  14. Can two numbers have 12 as their HCF and 512 as their LCM? Justify ...

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  15. Write all prime numbers between 50 and 100.

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

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  17. The least number which when divided by 6, 9, 12 and 19 leaves no re...

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  18. If the product of two number Rs is 360 and their HCF is 6, then the...

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  19. The LCM of two numbers is 26. The possible values of HCF are .........

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  20. Two perfect numbers are .................. and ..................

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