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The HCF and LCM of two natural numbers are 12 and 72 respectively. What is the difference between the two numbers if one of the numbers is 24?
(a)12
(b)18
(c)21
(d)24

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Important Questions on Number Systems
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Find the ratio of the LCM and the HCF of 5, 25 and 30.
(A) 1 : 6
(B) 30 : 1
(C) 1 : 30
(D) 6 : 1


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Find the HCF of 3, 7 and 15.
(A) 7
(B) 15
(C) 3
(D) 1


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Find the G.C.F and L.C.M of and .
1.
2.
3.
4.

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The LCM of two numbers is . If their HCF is and one of the numbers is , find the other number:

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