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The number of factors of 1080 is (a) 32 ...

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

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The number of even divisors of 10800 is (a) 16 (c) 36 (b) 31 (d) 48

The value of 30% of 60% of 200 is (a)23 (b) 24 (c)18 (d) 36

Number of proper factors of 2400 is equal to (a) 34 (b) 35 (c) 36 (d) 37

The product of three consecutive terms of a GP is 512. If 4 is added to each of the first and the second of these terms, the three terms now form an AP. Then the sum of the original three terms of the given GP is: (a) 36 (b) 32 (c) 24 (d) 28

Which of the following numbers is a perfect number? (a) 12 (b) 28 (c) 8 (d) 16

Number of ways to express 1200 as a product of two co-prime factors is (a) 1 (b) 2 (c) 4 (d) 8

Which of the following numbers is a perfect number? (a) 16 (b) 8 (c) 24 (d) 28

Write all the factors of the following numbers : (a) 24 (b) 15 (c) 21(d) 27 (e) 12 (f) 20(g) 18 (h) 23 (i) 36

Express the following as the sum of two odd primes. (a) 44 (b) 36 (c) 24 (d) 18

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

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

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

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

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  5. The HCF of first 100 natural numbers is:

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  6. The least number exactly divisible by 36 and 24 is (a)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 numbers is 360 and their HCF is 6, then their ...

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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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