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A number which has only two factors is c...

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

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RD SHARMA ENGLISH-PLAYING WITH NUMBERS-All Questions
  1. Reduce (289)/(391) to the lowest terms

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

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

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  4. The smallest composite number is ............

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

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  6. The HCF of two consecutive odd numbers is ............

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  7. The prime triplet is ...

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  8. The greatest five digit number exactly divisible by 9 and 13 is (a)...

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  9. From the set {2, 3, 4, 5, 6, 7, 8, 9}, how many pairs of co-primes can...

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  10. If the number 2345a60b is exactly divisible by 3 and 5, then the max...

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  11. The HCF of 100 and 101 is (a)10100          (b)  1001        (c) ...

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

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

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  14. The number of factors of 1080 is (a) 32 (b) 28 (c) 24 (d) 36

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  15. The HCF of first 100 natural numbers is:

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  16. The least number exactly divisible by 36 and 24 is (a)144         ...

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

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

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

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

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